-22.63% is the change from 835 to 646
Calculation steps:
[( 646 - 835 ) ÷ 835] x 100 = -22.63%
Formula
Percentage change = [(646 - 835) / 835] x 100
Subtract the new number by the original number
646 - 835 = -189
-189 ÷ 835 = -0.22634730538922157
-0.22634730538922157 x 100 = -22.63%