-19.54% is the change from 957 to 770
Calculation steps:
[( 770 - 957 ) ÷ 957] x 100 = -19.54%
Formula
Percentage change = [(770 - 957) / 957] x 100
Subtract the new number by the original number
770 - 957 = -187
-187 ÷ 957 = -0.19540229885057472
-0.19540229885057472 x 100 = -19.54%