-33.59% is the change from 637 to 423
Calculation steps:
[( 423 - 637 ) ÷ 637] x 100 = -33.59%
Formula
Percentage change = [(423 - 637) / 637] x 100
Subtract the new number by the original number
423 - 637 = -214
-214 ÷ 637 = -0.3359497645211931
-0.3359497645211931 x 100 = -33.59%