-30.29% is the change from 931 to 649
Calculation steps:
[( 649 - 931 ) ÷ 931] x 100 = -30.29%
Formula
Percentage change = [(649 - 931) / 931] x 100
Subtract the new number by the original number
649 - 931 = -282
-282 ÷ 931 = -0.3029001074113856
-0.3029001074113856 x 100 = -30.29%