-9.45% is the change from 921 to 834
Calculation steps:
[( 834 - 921 ) ÷ 921] x 100 = -9.45%
Formula
Percentage change = [(834 - 921) / 921] x 100
Subtract the new number by the original number
834 - 921 = -87
-87 ÷ 921 = -0.09446254071661238
-0.09446254071661238 x 100 = -9.45%