-0.85% is the change from 822 to 815
Calculation steps:
[( 815 - 822 ) ÷ 822] x 100 = -0.85%
Formula
Percentage change = [(815 - 822) / 822] x 100
Subtract the new number by the original number
815 - 822 = -7
-7 ÷ 822 = -0.00851581508515815
-0.00851581508515815 x 100 = -0.85%