-42.67% is the change from 921 to 528
Calculation steps:
[( 528 - 921 ) ÷ 921] x 100 = -42.67%
Formula
Percentage change = [(528 - 921) / 921] x 100
Subtract the new number by the original number
528 - 921 = -393
-393 ÷ 921 = -0.42671009771986973
-0.42671009771986973 x 100 = -42.67%