-81.54% is the change from 921 to 170
Calculation steps:
[( 170 - 921 ) ÷ 921] x 100 = -81.54%
Formula
Percentage change = [(170 - 921) / 921] x 100
Subtract the new number by the original number
170 - 921 = -751
-751 ÷ 921 = -0.8154180238870793
-0.8154180238870793 x 100 = -81.54%