-22.22% is the change from 828 to 644
Calculation steps:
[( 644 - 828 ) ÷ 828] x 100 = -22.22%
Formula
Percentage change = [(644 - 828) / 828] x 100
Subtract the new number by the original number
644 - 828 = -184
-184 ÷ 828 = -0.2222222222222222
-0.2222222222222222 x 100 = -22.22%