-13.25% is the change from 151 to 131
Calculation steps:
[( 131 - 151 ) ÷ 151] x 100 = -13.25%
Formula
Percentage change = [(131 - 151) / 151] x 100
Subtract the new number by the original number
131 - 151 = -20
-20 ÷ 151 = -0.13245033112582782
-0.13245033112582782 x 100 = -13.25%