fix median of balance

CarbonCalculation25.cs

@@ -311,6 +311,7 @@ namespace FarmMapsAPI.Carbon
                 var SOC_CarbonResidues = yearValues.Select(x => x.SOC_CarbonResidues).First()[1];
                 var SOC_CarbonManure = yearValues.Select(x => x.SOC_CarbonManure).First()[1];
                 var Emision = yearValues.Select(x => x.Emision).First()[1];
+                yearSummary.Balance = balance;
                 yearSummary.Bulk_Density = Bulk_Density;
                 yearSummary.Initial = Initial;
                 yearSummary.IniCcontent = IniCcontent;