-3.69% is the change from 217 to 209
Calculation steps:
[( 209 - 217 ) ÷ 217] x 100 = -3.69%
Formula
Percentage change = [(209 - 217) / 217] x 100
Subtract the new number by the original number
209 - 217 = -8
-8 ÷ 217 = -0.03686635944700461
-0.03686635944700461 x 100 = -3.69%