-20.62% is the change from 291 to 231
Calculation steps:
[( 231 - 291 ) ÷ 291] x 100 = -20.62%
Formula
Percentage change = [(231 - 291) / 291] x 100
Subtract the new number by the original number
231 - 291 = -60
-60 ÷ 291 = -0.20618556701030927
-0.20618556701030927 x 100 = -20.62%