-10.39% is the change from 231 to 207
Calculation steps:
[( 207 - 231 ) ÷ 231] x 100 = -10.39%
Formula
Percentage change = [(207 - 231) / 231] x 100
Subtract the new number by the original number
207 - 231 = -24
-24 ÷ 231 = -0.1038961038961039
-0.1038961038961039 x 100 = -10.39%