-86.62% is the change from 157 to 21
Calculation steps:
[( 21 - 157 ) ÷ 157] x 100 = -86.62%
Formula
Percentage change = [(21 - 157) / 157] x 100
Subtract the new number by the original number
21 - 157 = -136
-136 ÷ 157 = -0.8662420382165605
-0.8662420382165605 x 100 = -86.62%