-9% is the change from 311 to 283
Calculation steps:
[( 283 - 311 ) ÷ 311] x 100 = -9%
Formula
Percentage change = [(283 - 311) / 311] x 100
Subtract the new number by the original number
283 - 311 = -28
-28 ÷ 311 = -0.09003215434083602
-0.09003215434083602 x 100 = -9%