-89.92% is the change from 635 to 64
Calculation steps:
[( 64 - 635 ) ÷ 635] x 100 = -89.92%
Formula
Percentage change = [(64 - 635) / 635] x 100
Subtract the new number by the original number
64 - 635 = -571
-571 ÷ 635 = -0.8992125984251969
-0.8992125984251969 x 100 = -89.92%