-79.55% is the change from 836 to 171
Calculation steps:
[( 171 - 836 ) ÷ 836] x 100 = -79.55%
Formula
Percentage change = [(171 - 836) / 836] x 100
Subtract the new number by the original number
171 - 836 = -665
-665 ÷ 836 = -0.7954545454545454
-0.7954545454545454 x 100 = -79.55%