The given bar graph shows the sales of cars from six branches of a dealer B1, B2, B3, B4, B5, B6, during two consecutive years 2018 and 2019. Blue colour corresponds to the year 2018 and red colour corresponds to the year 2019.

The total sale of cars from all the branches in the year 2018 is what percentage less than the total sales of cars from all the branches in the year 2019? (correct to one decimal place)