-9.13% is the change from 230 to 209
Calculation steps:
[( 209 - 230 ) ÷ 230] x 100 = -9.13%
Formula
Percentage change = [(209 - 230) / 230] x 100
Subtract the new number by the original number
209 - 230 = -21
-21 ÷ 230 = -0.09130434782608696
-0.09130434782608696 x 100 = -9.13%