-2.16% is the change from 833 to 815
Calculation steps:
[( 815 - 833 ) ÷ 833] x 100 = -2.16%
Formula
Percentage change = [(815 - 833) / 833] x 100
Subtract the new number by the original number
815 - 833 = -18
-18 ÷ 833 = -0.021608643457382955
-0.021608643457382955 x 100 = -2.16%