-79.98% is the change from 829 to 166
Calculation steps:
[( 166 - 829 ) ÷ 829] x 100 = -79.98%
Formula
Percentage change = [(166 - 829) / 829] x 100
Subtract the new number by the original number
166 - 829 = -663
-663 ÷ 829 = -0.7997587454764777
-0.7997587454764777 x 100 = -79.98%