-86.71% is the change from 158 to 21
Calculation steps:
[( 21 - 158 ) ÷ 158] x 100 = -86.71%
Formula
Percentage change = [(21 - 158) / 158] x 100
Subtract the new number by the original number
21 - 158 = -137
-137 ÷ 158 = -0.8670886075949367
-0.8670886075949367 x 100 = -86.71%