-17.22% is the change from 209 to 173
Calculation steps:
[( 173 - 209 ) ÷ 209] x 100 = -17.22%
Formula
Percentage change = [(173 - 209) / 209] x 100
Subtract the new number by the original number
173 - 209 = -36
-36 ÷ 209 = -0.1722488038277512
-0.1722488038277512 x 100 = -17.22%