diff --git a/include/class-MailboxSizeAPI.php b/include/class-MailboxSizeAPI.php
index 4b9e9ab..0e3714c 100644
--- a/include/class-MailboxSizeAPI.php
+++ b/include/class-MailboxSizeAPI.php
@@ -1,89 +1,117 @@
 <?php
 # Copyright (C) 2018, 2019, 2020 Valerio Bozzolan
 # KISS Libre Hosting Panel
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
 # published by the Free Software Foundation, either version 3 of the
 # License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Affero General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 // load dependend traits
 class_exists( 'MailboxAPI' );
 
 /**
  * Methods for a MailboxSizeAPI class
  */
 trait MailboxSizeAPITrait {
 
-	use MailboxAPITrait;
-
 	/**
 	 * Select the MAX Mailbox quota date
 	 *
 	 * @return self
 	 */
 	public function selectMaxMailboxSizeDate() {
 		return $this->select( 'MAX( mailboxsize_date ) AS max_mailboxsize_date' )
 		            ->groupBy( 'mailbox_ID' );
 	}
 
+	/**
+	 * Limit to a specific date interval
+	 *
+	 * @param $one DateTime
+	 * @param $two DateTime
+	 * @return     self
+	 */
+	public function whereMailboxSizeBetweenDates( $one, $two ) {
+		$from = $one->format( 'Y-m-d H:i:s' );
+		$to   = $two->format( 'Y-m-d H:i:s' );
+		return $this->where( sprintf(
+			"mailboxsize_date BETWEEN '%s' AND '%s'",
+			$from,
+			$to
+		)  );
+	}
+
+	/**
+	 * Limit to the last 12 months
+	 *
+	 * @return self
+	 */
+	public function whereMailboxSizeInLatestYear() {
+		$now  = new DateTime();
+		$past = new DateTime();
+		$past->sub( new DateInterval( 'P1Y' ) );
+		return $this->whereMailboxSizeBetweenDates( $past, $now );
+	}
+
 	/**
 	 * Assure that this is only the more updated Mailbox quota
 	 *
 	 * @return self
 	 */
 	public function whereMailboxSizeIsLast() {
 
 		// subquery with a maximum constraint
 		$max = ( new MailboxSizeAPI( null, false ) )
 			->fromCustom( DB::instance()->getTable( 'mailboxsize', 'mailboxsize_sub' ) )
 			->equals( 'mailboxsize.mailbox_ID', 'mailboxsize_sub.mailbox_ID' )
 			->selectMaxMailboxSizeDate()
 			->getQuery();
 
 		return $this->where( sprintf( 'mailboxsize_date = (%s)', $max ) );
 	}
 }
 
 /**
  * MailboxSize API
  */
 class MailboxSizeAPI extends Query {
 
 	use MailboxSizeAPITrait;
+	use MailboxAPITrait;
 
 	/**
 	 * Univoque column name to the Mailbox ID
 	 */
 	protected $MAILBOX_ID = 'mailboxsize.mailbox_ID';
 
 	/**
 	 * Constructor
 	 *
 	 * @param object $db   Database
 	 * @param mixed  $from Set to false to avoid to use the default FROM
 	 */
 	public function __construct( $db = null, $from = true ) {
 
 		// set database and class name
 		parent::__construct( $db, MailboxSize::class );
 
 		/**
 		 * Set database table (sometime the standard alias it's not useful)
 		 *
 		 * See MailboxSizeAPI class.
 		 */
 		if( $from ) {
 			$this->from( MailboxSize::T );
 		}
 	}
 
 }
diff --git a/template/mailbox-stats-size-chart.php b/template/mailbox-stats-size-chart.php
new file mode 100644
index 0000000..946ed85
--- /dev/null
+++ b/template/mailbox-stats-size-chart.php
@@ -0,0 +1,62 @@
+<?php
+# Copyright (C) 2018, 2019, 2020 Valerio Bozzolan
+# KISS Libre Hosting Panel
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+/*
+ * This is the template for a Mailbox size chart.
+ *
+ * Called from:
+ * 	template/mailbox-stats.php
+ *
+ * Available variables:
+ * 	$mailbox object
+ */
+
+// avoid to be load directly
+defined( 'BOZ_PHP' ) or die;
+
+// query one year of data
+$stats = ( new MailboxSizeAPI() )
+	->whereMailbox( $mailbox )
+	->whereMailboxSizeInLatestYear()
+	->queryGenerator();
+
+// prepare the chart
+$chart_args = [
+	// label used for the y axis
+	'ylabel' => __( "Size" ),
+
+	// label used for each y axis data
+	'ylabel-format' => function( $bytes ) {
+		return human_filesize( $bytes );
+	},
+];
+
+// prepare the chart
+$chart = new ASCIILineChart();
+foreach( $stats as $stat ) {
+	$chart->add( $stat->getMailboxSizeDate(), $stat->getMailboxSizeBytes() );
+}
+
+// sort by date
+$chart->sort();
+?>
+
+	<!-- start size chart -->
+	<h3><?= esc_html( __( "Track Size" ) ) ?></h3>
+
+	<pre class="ascii-chart"><?= $chart->render( $chart_args ) ?></pre>
+	<!-- end size chart -->
diff --git a/template/mailbox-stats.php b/template/mailbox-stats.php
index 5ff9934..4eceda3 100644
--- a/template/mailbox-stats.php
+++ b/template/mailbox-stats.php
@@ -1,85 +1,91 @@
 <?php
 # Copyright (C) 2018, 2019, 2020 Valerio Bozzolan
 # KISS Libre Hosting Panel
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
 # published by the Free Software Foundation, either version 3 of the
 # License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Affero General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 /*
  * This is the template for some mailbox stats
  *
  * Called from:
  * 	template/mailbox.php
  *
  * Available variables:
  * 	$mailbox object
  *      $plan    object
  */
 
 // avoid to be load directly
 defined( 'BOZ_PHP' ) or die;
 
 // calculate the remaining Mailbox quota percentage
 $remaining_quota_percentage = null;
 if( $plan ) {
 	$remaining_quota_percentage = Plan::percentage(
 		$mailbox->getMailboxLastSizeBytes(),
 		$plan->getPlanMailboxQuota()
 	);
 
 	if( $remaining_quota_percentage ) {
 		$remaining_quota_percentage = 100 - $remaining_quota_percentage;
 	}
 }
 ?>
 
 	<h3><?= esc_html( __( "Stats" ) ) ?></h3>
 
 	<?php if( $mailbox->getMailboxLastSizeBytes() !== null ): ?>
 
 		<!-- start stats table -->
 		<table class="table table-bordered table-responsive">
 
 			<!-- start actual size -->
 			<tr>
 				<th><?= esc_html( __( "Current Size" ) ) ?></th>
 				<td><?= human_filesize( $mailbox->getMailboxLastSizeBytes() ) ?></td>
 			</tr>
 			<!-- end actual size -->
 
 			<!-- start max size allowed -->
 			<?php if( $plan && $plan->getPlanMailboxQuota() ): ?>
 			<tr>
 				<th><?= esc_html( __( "Allowed Size" ) ) ?></th>
 				<td><?= human_filesize( $mailbox->getPlanMailboxQuota() ) ?></td>
 			</tr>
 			<?php endif ?>
 			<!-- endmax size allowed -->
 
 			<!-- start quota ratio -->
 			<?php if( $remaining_quota_percentage !== null ): ?>
 			<tr>
 				<th><?= esc_html( __( "Free" ) ) ?></th>
 				<td><?= $remaining_quota_percentage ?> %</td>
 			</tr>
 			<?php endif ?>
 			<!-- end quota ratio -->
 
 		</table>
 		<!-- end stats table -->
 
+
+		<?php template( 'mailbox-stats-size-chart', [
+			'mailbox' => $mailbox,
+		] ) ?>
+
+
 	<?php else: ?>
 
 		<?= esc_html( __( "No stats available" ) ) ?>
 
 	<?php endif ?>
diff --git a/www/content/style.css b/www/content/style.css
index e69de29..392493b 100644
--- a/www/content/style.css
+++ b/www/content/style.css
@@ -0,0 +1,4 @@
+.ascii-chart {
+	overflow-y:auto;
+	line-height:1;
+}