-33.55% is the change from 921 to 612
Calculation steps:
[( 612 - 921 ) ÷ 921] x 100 = -33.55%
Formula
Percentage change = [(612 - 921) / 921] x 100
Subtract the new number by the original number
612 - 921 = -309
-309 ÷ 921 = -0.3355048859934853
-0.3355048859934853 x 100 = -33.55%