-22.22% is the change from 819 to 637
Calculation steps:
[( 637 - 819 ) ÷ 819] x 100 = -22.22%
Formula
Percentage change = [(637 - 819) / 819] x 100
Subtract the new number by the original number
637 - 819 = -182
-182 ÷ 819 = -0.2222222222222222
-0.2222222222222222 x 100 = -22.22%