-90.39% is the change from 635 to 61
Calculation steps:
[( 61 - 635 ) ÷ 635] x 100 = -90.39%
Formula
Percentage change = [(61 - 635) / 635] x 100
Subtract the new number by the original number
61 - 635 = -574
-574 ÷ 635 = -0.9039370078740158
-0.9039370078740158 x 100 = -90.39%