-7.73% is the change from 233 to 215
Calculation steps:
[( 215 - 233 ) ÷ 233] x 100 = -7.73%
Formula
Percentage change = [(215 - 233) / 233] x 100
Subtract the new number by the original number
215 - 233 = -18
-18 ÷ 233 = -0.07725321888412018
-0.07725321888412018 x 100 = -7.73%