DATETIME) IF ((@MinPopulationYear IS NULL) OR (@MaxPopulationYear IS NULL)) BEGIN - Populate from @NewMinPopulationYear to ...

] DATETIME) 
        
        IF ((@MinPopulationYear IS NULL) OR (@MaxPopulationYear IS NULL))
            BEGIN
                -- Populate from @NewMinPopulationYear to @NewMaxPopulationYear    
                SELECT @time = @NewMinPopulationYear
                WHILE @time < DATEADD(Year, 1, @NewMaxPopulationYear)
                BEGIN
                    INSERT INTO #temp