-39.05% is the change from 822 to 501
Calculation steps:
[( 501 - 822 ) ÷ 822] x 100 = -39.05%
Formula
Percentage change = [(501 - 822) / 822] x 100
Subtract the new number by the original number
501 - 822 = -321
-321 ÷ 822 = -0.3905109489051095
-0.3905109489051095 x 100 = -39.05%