-81% is the change from 837 to 159
Calculation steps:
[( 159 - 837 ) ÷ 837] x 100 = -81%
Formula
Percentage change = [(159 - 837) / 837] x 100
Subtract the new number by the original number
159 - 837 = -678
-678 ÷ 837 = -0.8100358422939068
-0.8100358422939068 x 100 = -81%