-19.59% is the change from 822 to 661
Calculation steps:
[( 661 - 822 ) ÷ 822] x 100 = -19.59%
Formula
Percentage change = [(661 - 822) / 822] x 100
Subtract the new number by the original number
661 - 822 = -161
-161 ÷ 822 = -0.19586374695863748
-0.19586374695863748 x 100 = -19.59%