-61.07% is the change from 131 to 51
Calculation steps:
[( 51 - 131 ) ÷ 131] x 100 = -61.07%
Formula
Percentage change = [(51 - 131) / 131] x 100
Subtract the new number by the original number
51 - 131 = -80
-80 ÷ 131 = -0.6106870229007634
-0.6106870229007634 x 100 = -61.07%