34.55% is the change from 191 to 257
Calculation steps:
[( 257 - 191 ) ÷ 191] x 100 = 34.55%
Formula
Percentage change = [(257 - 191) / 191] x 100
Subtract the new number by the original number
257 - 191 = 66
66 ÷ 191 = 0.34554973821989526
0.34554973821989526 x 100 = 34.55%