25.9% is the change from 166 to 209
Calculation steps:
[( 209 - 166 ) ÷ 166] x 100 = 25.9%
Formula
Percentage change = [(209 - 166) / 166] x 100
Subtract the new number by the original number
209 - 166 = 43
43 ÷ 166 = 0.25903614457831325
0.25903614457831325 x 100 = 25.9%