-39.84% is the change from 251 to 151
Calculation steps:
[( 151 - 251 ) ÷ 251] x 100 = -39.84%
Formula
Percentage change = [(151 - 251) / 251] x 100
Subtract the new number by the original number
151 - 251 = -100
-100 ÷ 251 = -0.398406374501992
-0.398406374501992 x 100 = -39.84%