-8.61% is the change from 209 to 191
Calculation steps:
[( 191 - 209 ) ÷ 209] x 100 = -8.61%
Formula
Percentage change = [(191 - 209) / 209] x 100
Subtract the new number by the original number
191 - 209 = -18
-18 ÷ 209 = -0.0861244019138756
-0.0861244019138756 x 100 = -8.61%