-66.56% is the change from 957 to 320
Calculation steps:
[( 320 - 957 ) ÷ 957] x 100 = -66.56%
Formula
Percentage change = [(320 - 957) / 957] x 100
Subtract the new number by the original number
320 - 957 = -637
-637 ÷ 957 = -0.6656217345872518
-0.6656217345872518 x 100 = -66.56%