-20.88% is the change from 637 to 504
Calculation steps:
[( 504 - 637 ) ÷ 637] x 100 = -20.88%
Formula
Percentage change = [(504 - 637) / 637] x 100
Subtract the new number by the original number
504 - 637 = -133
-133 ÷ 637 = -0.2087912087912088
-0.2087912087912088 x 100 = -20.88%