-22.87% is the change from 835 to 644
Calculation steps:
[( 644 - 835 ) ÷ 835] x 100 = -22.87%
Formula
Percentage change = [(644 - 835) / 835] x 100
Subtract the new number by the original number
644 - 835 = -191
-191 ÷ 835 = -0.22874251497005987
-0.22874251497005987 x 100 = -22.87%