-5% is the change from 220 to 209
Calculation steps:
[( 209 - 220 ) ÷ 220] x 100 = -5%
Formula
Percentage change = [(209 - 220) / 220] x 100
Subtract the new number by the original number
209 - 220 = -11
-11 ÷ 220 = -0.05
-0.05 x 100 = -5%
Example