-20.1% is the change from 826 to 660
Calculation steps:
[( 660 - 826 ) ÷ 826] x 100 = -20.1%
Formula
Percentage change = [(660 - 826) / 826] x 100
Subtract the new number by the original number
660 - 826 = -166
-166 ÷ 826 = -0.2009685230024213
-0.2009685230024213 x 100 = -20.1%