-31.33% is the change from 932 to 640
Calculation steps:
[( 640 - 932 ) ÷ 932] x 100 = -31.33%
Formula
Percentage change = [(640 - 932) / 932] x 100
Subtract the new number by the original number
640 - 932 = -292
-292 ÷ 932 = -0.3133047210300429
-0.3133047210300429 x 100 = -31.33%