-40.49% is the change from 657 to 391
Calculation steps:
[( 391 - 657 ) ÷ 657] x 100 = -40.49%
Formula
Percentage change = [(391 - 657) / 657] x 100
Subtract the new number by the original number
391 - 657 = -266
-266 ÷ 657 = -0.4048706240487062
-0.4048706240487062 x 100 = -40.49%