-90.09% is the change from 636 to 63
Calculation steps:
[( 63 - 636 ) ÷ 636] x 100 = -90.09%
Formula
Percentage change = [(63 - 636) / 636] x 100
Subtract the new number by the original number
63 - 636 = -573
-573 ÷ 636 = -0.9009433962264151
-0.9009433962264151 x 100 = -90.09%