-20.94% is the change from 635 to 502
Calculation steps:
[( 502 - 635 ) ÷ 635] x 100 = -20.94%
Formula
Percentage change = [(502 - 635) / 635] x 100
Subtract the new number by the original number
502 - 635 = -133
-133 ÷ 635 = -0.2094488188976378
-0.2094488188976378 x 100 = -20.94%