-81.92% is the change from 636 to 115
Calculation steps:
[( 115 - 636 ) ÷ 636] x 100 = -81.92%
Formula
Percentage change = [(115 - 636) / 636] x 100
Subtract the new number by the original number
115 - 636 = -521
-521 ÷ 636 = -0.8191823899371069
-0.8191823899371069 x 100 = -81.92%