-20.24% is the change from 835 to 666
Calculation steps:
[( 666 - 835 ) ÷ 835] x 100 = -20.24%
Formula
Percentage change = [(666 - 835) / 835] x 100
Subtract the new number by the original number
666 - 835 = -169
-169 ÷ 835 = -0.20239520958083831
-0.20239520958083831 x 100 = -20.24%