-86.95% is the change from 636 to 83
Calculation steps:
[( 83 - 636 ) ÷ 636] x 100 = -86.95%
Formula
Percentage change = [(83 - 636) / 636] x 100
Subtract the new number by the original number
83 - 636 = -553
-553 ÷ 636 = -0.8694968553459119
-0.8694968553459119 x 100 = -86.95%