1 files changed, 19 insertions, 2 deletions
diff --git a/core/NumberFormatter.php b/core/NumberFormatter.php
index f294508185..141bcdae8d 100644
--- a/core/NumberFormatter.php
+++ b/core/NumberFormatter.php
@@ -8,8 +8,6 @@
  */
 namespace Piwik;
 
-use Piwik\Container\StaticContainer;
-
 /**
  * Class NumberFormatter
  *
@@ -148,6 +146,25 @@ class NumberFormatter extends Singleton
         return $this->formatNumberWithPattern($pattern, $newValue, $maximumFractionDigits, $minimumFractionDigits);
     }
 
+
+    /**
+     * Formats given number as percent value, but keep the leading + sign if found
+     *
+     * @param $value
+     * @return string
+     */
+    public function formatPercentEvolution($value)
+    {
+        $isPositiveEvolution = !empty($value) && ($value > 0 || $value[0] == '+');
+
+        $formatted = self::formatPercent($value);
+
+        if($isPositiveEvolution) {
+            return '+' . $formatted;
+        }
+        return $formatted;
+    }
+
     /**
      * Formats given number as percent value
      * @param string|int|float $value