-1.7% is the change from 235 to 231
Calculation steps:
[( 231 - 235 ) ÷ 235] x 100 = -1.7%
Formula
Percentage change = [(231 - 235) / 235] x 100
Subtract the new number by the original number
231 - 235 = -4
-4 ÷ 235 = -0.01702127659574468
-0.01702127659574468 x 100 = -1.7%