-20.86% is the change from 834 to 660
Calculation steps:
[( 660 - 834 ) ÷ 834] x 100 = -20.86%
Formula
Percentage change = [(660 - 834) / 834] x 100
Subtract the new number by the original number
660 - 834 = -174
-174 ÷ 834 = -0.20863309352517986
-0.20863309352517986 x 100 = -20.86%