-21.53% is the change from 822 to 645
Calculation steps:
[( 645 - 822 ) ÷ 822] x 100 = -21.53%
Formula
Percentage change = [(645 - 822) / 822] x 100
Subtract the new number by the original number
645 - 822 = -177
-177 ÷ 822 = -0.21532846715328466
-0.21532846715328466 x 100 = -21.53%