20.81% is the change from 173 to 209
Calculation steps:
[( 209 - 173 ) ÷ 173] x 100 = 20.81%
Formula
Percentage change = [(209 - 173) / 173] x 100
Subtract the new number by the original number
209 - 173 = 36
36 ÷ 173 = 0.20809248554913296
0.20809248554913296 x 100 = 20.81%