diff --git a/htdocs/core/boxes/box_graph_invoices_permonth.php b/htdocs/core/boxes/box_graph_invoices_permonth.php
index 843c64bbd44..ab39a14e2cd 100644
--- a/htdocs/core/boxes/box_graph_invoices_permonth.php
+++ b/htdocs/core/boxes/box_graph_invoices_permonth.php
@@ -128,7 +128,7 @@ class box_graph_invoices_permonth extends ModeleBoxes
 			if (empty($endyear)) {
 				$endyear = $nowarray['year'];
 			}
-			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 1 : $conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH);
+			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 2 : ($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH - 1));
 
 			$mode = 'customer';
 			$WIDTH = (($shownb && $showtot) || !empty($conf->dol_optimize_smallscreen)) ? '256' : '320';
diff --git a/htdocs/core/boxes/box_graph_invoices_supplier_permonth.php b/htdocs/core/boxes/box_graph_invoices_supplier_permonth.php
index 124e6e8dd24..75b58a28de1 100644
--- a/htdocs/core/boxes/box_graph_invoices_supplier_permonth.php
+++ b/htdocs/core/boxes/box_graph_invoices_supplier_permonth.php
@@ -128,7 +128,7 @@ class box_graph_invoices_supplier_permonth extends ModeleBoxes
 			if (empty($endyear)) {
 				$endyear = $nowarray['year'];
 			}
-			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 1 : $conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH);
+			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 2 : ($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH - 1));
 
 			$mode = 'supplier';
 			$WIDTH = (($shownb && $showtot) || !empty($conf->dol_optimize_smallscreen)) ? '256' : '320';
diff --git a/htdocs/core/boxes/box_graph_orders_permonth.php b/htdocs/core/boxes/box_graph_orders_permonth.php
index 82e3452c151..3fafa464993 100644
--- a/htdocs/core/boxes/box_graph_orders_permonth.php
+++ b/htdocs/core/boxes/box_graph_orders_permonth.php
@@ -128,7 +128,7 @@ class box_graph_orders_permonth extends ModeleBoxes
 			if (empty($endyear)) {
 				$endyear = $nowarray['year'];
 			}
-			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 1 : $conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH);
+			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 2 : ($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH - 1));
 
 			$mode = 'customer';
 			$WIDTH = (($shownb && $showtot) || !empty($conf->dol_optimize_smallscreen)) ? '256' : '320';
diff --git a/htdocs/core/boxes/box_graph_orders_supplier_permonth.php b/htdocs/core/boxes/box_graph_orders_supplier_permonth.php
index a4a764e6d57..419e3afba83 100644
--- a/htdocs/core/boxes/box_graph_orders_supplier_permonth.php
+++ b/htdocs/core/boxes/box_graph_orders_supplier_permonth.php
@@ -127,7 +127,7 @@ class box_graph_orders_supplier_permonth extends ModeleBoxes
 			if (empty($endyear)) {
 				$endyear = $nowarray['year'];
 			}
-			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 1 : $conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH);
+			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 2 : ($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH - 1));
 
 			$mode = 'supplier';
 			$WIDTH = (($shownb && $showtot) || !empty($conf->dol_optimize_smallscreen)) ? '256' : '320';
diff --git a/htdocs/core/boxes/box_graph_propales_permonth.php b/htdocs/core/boxes/box_graph_propales_permonth.php
index 116beb0e30f..8193e81d060 100644
--- a/htdocs/core/boxes/box_graph_propales_permonth.php
+++ b/htdocs/core/boxes/box_graph_propales_permonth.php
@@ -128,7 +128,7 @@ class box_graph_propales_permonth extends ModeleBoxes
 			if (empty($endyear)) {
 				$endyear = $nowarray['year'];
 			}
-			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 1 : $conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH);
+			$startyear = $endyear - (empty($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH) ? 2 : ($conf->global->MAIN_NB_OF_YEAR_IN_WIDGET_GRAPH - 1));
 
 			$WIDTH = (($shownb && $showtot) || !empty($conf->dol_optimize_smallscreen)) ? '256' : '320';
 			$HEIGHT = '192';