-19.62% is the change from 637 to 512
Calculation steps:
[( 512 - 637 ) ÷ 637] x 100 = -19.62%
Formula
Percentage change = [(512 - 637) / 637] x 100
Subtract the new number by the original number
512 - 637 = -125
-125 ÷ 637 = -0.19623233908948196
-0.19623233908948196 x 100 = -19.62%