-1.2% is the change from 833 to 823
Calculation steps:
[( 823 - 833 ) ÷ 833] x 100 = -1.2%
Formula
Percentage change = [(823 - 833) / 833] x 100
Subtract the new number by the original number
823 - 833 = -10
-10 ÷ 833 = -0.012004801920768308
-0.012004801920768308 x 100 = -1.2%