-9.12% is the change from 921 to 837
Calculation steps:
[( 837 - 921 ) ÷ 921] x 100 = -9.12%
Formula
Percentage change = [(837 - 921) / 921] x 100
Subtract the new number by the original number
837 - 921 = -84
-84 ÷ 921 = -0.09120521172638436
-0.09120521172638436 x 100 = -9.12%