-56.34% is the change from 71 to 31
Calculation steps:
[( 31 - 71 ) ÷ 71] x 100 = -56.34%
Formula
Percentage change = [(31 - 71) / 71] x 100
Subtract the new number by the original number
31 - 71 = -40
-40 ÷ 71 = -0.5633802816901409
-0.5633802816901409 x 100 = -56.34%