-30.87% is the change from 933 to 645
Calculation steps:
[( 645 - 933 ) ÷ 933] x 100 = -30.87%
Formula
Percentage change = [(645 - 933) / 933] x 100
Subtract the new number by the original number
645 - 933 = -288
-288 ÷ 933 = -0.3086816720257235
-0.3086816720257235 x 100 = -30.87%