-30.76% is the change from 933 to 646
Calculation steps:
[( 646 - 933 ) ÷ 933] x 100 = -30.76%
Formula
Percentage change = [(646 - 933) / 933] x 100
Subtract the new number by the original number
646 - 933 = -287
-287 ÷ 933 = -0.30760986066452306
-0.30760986066452306 x 100 = -30.76%