-31.62% is the change from 933 to 638
Calculation steps:
[( 638 - 933 ) ÷ 933] x 100 = -31.62%
Formula
Percentage change = [(638 - 933) / 933] x 100
Subtract the new number by the original number
638 - 933 = -295
-295 ÷ 933 = -0.3161843515541265
-0.3161843515541265 x 100 = -31.62%