-2.4% is the change from 833 to 813
Calculation steps:
[( 813 - 833 ) ÷ 833] x 100 = -2.4%
Formula
Percentage change = [(813 - 833) / 833] x 100
Subtract the new number by the original number
813 - 833 = -20
-20 ÷ 833 = -0.024009603841536616
-0.024009603841536616 x 100 = -2.4%