-80.98% is the change from 836 to 159
Calculation steps:
[( 159 - 836 ) ÷ 836] x 100 = -80.98%
Formula
Percentage change = [(159 - 836) / 836] x 100
Subtract the new number by the original number
159 - 836 = -677
-677 ÷ 836 = -0.8098086124401914
-0.8098086124401914 x 100 = -80.98%