15.71% is the change from 191 to 221
Calculation steps:
[( 221 - 191 ) ÷ 191] x 100 = 15.71%
Formula
Percentage change = [(221 - 191) / 191] x 100
Subtract the new number by the original number
221 - 191 = 30
30 ÷ 191 = 0.15706806282722513
0.15706806282722513 x 100 = 15.71%