-86.54% is the change from 156 to 21
Calculation steps:
[( 21 - 156 ) ÷ 156] x 100 = -86.54%
Formula
Percentage change = [(21 - 156) / 156] x 100
Subtract the new number by the original number
21 - 156 = -135
-135 ÷ 156 = -0.8653846153846154
-0.8653846153846154 x 100 = -86.54%