39.5% is the change from 686 to 957
Calculation steps:
[( 957 - 686 ) ÷ 686] x 100 = 39.5%
Formula
Percentage change = [(957 - 686) / 686] x 100
Subtract the new number by the original number
957 - 686 = 271
271 ÷ 686 = 0.39504373177842567
0.39504373177842567 x 100 = 39.5%