-22.97% is the change from 836 to 644
Calculation steps:
[( 644 - 836 ) ÷ 836] x 100 = -22.97%
Formula
Percentage change = [(644 - 836) / 836] x 100
Subtract the new number by the original number
644 - 836 = -192
-192 ÷ 836 = -0.22966507177033493
-0.22966507177033493 x 100 = -22.97%