-33.7% is the change from 635 to 421
Calculation steps:
[( 421 - 635 ) ÷ 635] x 100 = -33.7%
Formula
Percentage change = [(421 - 635) / 635] x 100
Subtract the new number by the original number
421 - 635 = -214
-214 ÷ 635 = -0.33700787401574805
-0.33700787401574805 x 100 = -33.7%