-78.94% is the change from 812 to 171
Calculation steps:
[( 171 - 812 ) ÷ 812] x 100 = -78.94%
Formula
Percentage change = [(171 - 812) / 812] x 100
Subtract the new number by the original number
171 - 812 = -641
-641 ÷ 812 = -0.7894088669950738
-0.7894088669950738 x 100 = -78.94%