-2.6% is the change from 231 to 225
Calculation steps:
[( 225 - 231 ) ÷ 231] x 100 = -2.6%
Formula
Percentage change = [(225 - 231) / 231] x 100
Subtract the new number by the original number
225 - 231 = -6
-6 ÷ 231 = -0.025974025974025976
-0.025974025974025976 x 100 = -2.6%