diff --git a/src/Trend.php b/src/Trend.php
index 5a2c37b..02fb3a7 100755
--- a/src/Trend.php
+++ b/src/Trend.php
@@ -140,6 +140,7 @@ public function mapValuesToDates(Collection $values): Collection
         return $values
             ->merge($placeholders)
             ->unique('date')
+            ->sort()
             ->flatten();
     }