20.1% is the change from 209 to 251
Calculation steps:
[( 251 - 209 ) ÷ 209] x 100 = 20.1%
Formula
Percentage change = [(251 - 209) / 209] x 100
Subtract the new number by the original number
251 - 209 = 42
42 ÷ 209 = 0.20095693779904306
0.20095693779904306 x 100 = 20.1%