-62.65% is the change from 83 to 31
Calculation steps:
[( 31 - 83 ) ÷ 83] x 100 = -62.65%
Formula
Percentage change = [(31 - 83) / 83] x 100
Subtract the new number by the original number
31 - 83 = -52
-52 ÷ 83 = -0.6265060240963856
-0.6265060240963856 x 100 = -62.65%