-21.65% is the change from 822 to 644
Calculation steps:
[( 644 - 822 ) ÷ 822] x 100 = -21.65%
Formula
Percentage change = [(644 - 822) / 822] x 100
Subtract the new number by the original number
644 - 822 = -178
-178 ÷ 822 = -0.21654501216545013
-0.21654501216545013 x 100 = -21.65%