-86.93% is the change from 635 to 83
Calculation steps:
[( 83 - 635 ) ÷ 635] x 100 = -86.93%
Formula
Percentage change = [(83 - 635) / 635] x 100
Subtract the new number by the original number
83 - 635 = -552
-552 ÷ 635 = -0.8692913385826772
-0.8692913385826772 x 100 = -86.93%