-28.66% is the change from 921 to 657
Calculation steps:
[( 657 - 921 ) ÷ 921] x 100 = -28.66%
Formula
Percentage change = [(657 - 921) / 921] x 100
Subtract the new number by the original number
657 - 921 = -264
-264 ÷ 921 = -0.28664495114006516
-0.28664495114006516 x 100 = -28.66%