-18.42% is the change from 809 to 660
Calculation steps:
[( 660 - 809 ) ÷ 809] x 100 = -18.42%
Formula
Percentage change = [(660 - 809) / 809] x 100
Subtract the new number by the original number
660 - 809 = -149
-149 ÷ 809 = -0.1841779975278121
-0.1841779975278121 x 100 = -18.42%