-79.2% is the change from 822 to 171
Calculation steps:
[( 171 - 822 ) ÷ 822] x 100 = -79.2%
Formula
Percentage change = [(171 - 822) / 822] x 100
Subtract the new number by the original number
171 - 822 = -651
-651 ÷ 822 = -0.791970802919708
-0.791970802919708 x 100 = -79.2%