-9.23% is the change from 921 to 836
Calculation steps:
[( 836 - 921 ) ÷ 921] x 100 = -9.23%
Formula
Percentage change = [(836 - 921) / 921] x 100
Subtract the new number by the original number
836 - 921 = -85
-85 ÷ 921 = -0.09229098805646037
-0.09229098805646037 x 100 = -9.23%