-79.43% is the change from 836 to 172
Calculation steps:
[( 172 - 836 ) ÷ 836] x 100 = -79.43%
Formula
Percentage change = [(172 - 836) / 836] x 100
Subtract the new number by the original number
172 - 836 = -664
-664 ÷ 836 = -0.7942583732057417
-0.7942583732057417 x 100 = -79.43%