-31.28% is the change from 940 to 646
Calculation steps:
[( 646 - 940 ) ÷ 940] x 100 = -31.28%
Formula
Percentage change = [(646 - 940) / 940] x 100
Subtract the new number by the original number
646 - 940 = -294
-294 ÷ 940 = -0.3127659574468085
-0.3127659574468085 x 100 = -31.28%