-32.8% is the change from 311 to 209
Calculation steps:
[( 209 - 311 ) ÷ 311] x 100 = -32.8%
Formula
Percentage change = [(209 - 311) / 311] x 100
Subtract the new number by the original number
209 - 311 = -102
-102 ÷ 311 = -0.3279742765273312
-0.3279742765273312 x 100 = -32.8%