-87.18% is the change from 156 to 20
Calculation steps:
[( 20 - 156 ) ÷ 156] x 100 = -87.18%
Formula
Percentage change = [(20 - 156) / 156] x 100
Subtract the new number by the original number
20 - 156 = -136
-136 ÷ 156 = -0.8717948717948718
-0.8717948717948718 x 100 = -87.18%