-86.36% is the change from 154 to 21
Calculation steps:
[( 21 - 154 ) ÷ 154] x 100 = -86.36%
Formula
Percentage change = [(21 - 154) / 154] x 100
Subtract the new number by the original number
21 - 154 = -133
-133 ÷ 154 = -0.8636363636363636
-0.8636363636363636 x 100 = -86.36%