Index: binaries/data/mods/public/gui/summary/layout.js
===================================================================
--- binaries/data/mods/public/gui/summary/layout.js
+++ binaries/data/mods/public/gui/summary/layout.js
@@ -151,7 +151,7 @@
 		"headings": [
 			{ "identifier": "playername", "caption": translate("Player name"), "yStart": 26, "width": 200 },
 			{ "identifier": "tradeIncome", "caption": translate("Trade income"), "yStart": 16, "width": 100 },
-			{ "identifier": "barterEfficency", "caption": translate("Barter efficiency"), "yStart": 16, "width": 100 },
+			{ "identifier": "barterEfficency", "caption": translate("Barter efficiency"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
 			...g_ResourceData.GetResources().map(res => {
 				return {
 					"identifier": res.code,
@@ -183,11 +183,11 @@
 		"headings": [
 			{ "identifier": "playername", "caption": translate("Player name"), "yStart": 26, "width": 200 },
 			{ "identifier": "killDeath", "caption": translate("Kill / Death ratio"), "yStart": 16, "width": 100, "format": "DECIMAL2" },
-			{ "identifier": "mapControlPeak", "caption": translate("Map control (peak)"), "yStart": 16, "width": 100 },
-			{ "identifier": "mapControl", "caption": translate("Map control (finish)"), "yStart": 16, "width": 100 },
-			{ "identifier": "mapExploration", "caption": translate("Map exploration"), "yStart": 16, "width": 100 },
-			{ "identifier": "vegetarianRatio", "caption": translate("Vegetarian ratio"), "yStart": 16, "width": 100 },
-			{ "identifier": "feminization", "caption": translate("Feminization"), "yStart": 16, "width": 100 },
+			{ "identifier": "mapControlPeak", "caption": translate("Map control (peak)"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
+			{ "identifier": "mapControl", "caption": translate("Map control (finish)"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
+			{ "identifier": "mapExploration", "caption": translate("Map exploration"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
+			{ "identifier": "vegetarianRatio", "caption": translate("Vegetarian ratio"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
+			{ "identifier": "feminization", "caption": translate("Feminization"), "yStart": 16, "width": 100, "format": "PERCENTAGE" },
 			{
 				"identifier": "bribes",
 				"caption": translate("Bribes"),
Index: source/gui/CChart.cpp
===================================================================
--- source/gui/CChart.cpp
+++ source/gui/CChart.cpp
@@ -280,6 +280,12 @@
 		swprintf(buffer, 64, L"%d:%02d", seconds / 60, seconds % 60);
 		gui_str.SetValue(buffer);
 	}
+	else if (format == L"PERCENTAGE")
+	{
+		wchar_t buffer[64];
+		swprintf(buffer, 64, L"%d%%", static_cast<int>(value));
+		gui_str.SetValue(buffer);
+	}
 	else
 	{
 		LOGERROR("Unsupported chart format: " + format.EscapeToPrintableASCII());