-30.9% is the change from 932 to 644
Calculation steps:
[( 644 - 932 ) ÷ 932] x 100 = -30.9%
Formula
Percentage change = [(644 - 932) / 932] x 100
Subtract the new number by the original number
644 - 932 = -288
-288 ÷ 932 = -0.3090128755364807
-0.3090128755364807 x 100 = -30.9%