-0.86% is the change from 233 to 231
Calculation steps:
[( 231 - 233 ) ÷ 233] x 100 = -0.86%
Formula
Percentage change = [(231 - 233) / 233] x 100
Subtract the new number by the original number
231 - 233 = -2
-2 ÷ 233 = -0.008583690987124463
-0.008583690987124463 x 100 = -0.86%