16.74% is the change from 215 to 251
Calculation steps:
[( 251 - 215 ) ÷ 215] x 100 = 16.74%
Formula
Percentage change = [(251 - 215) / 215] x 100
Subtract the new number by the original number
251 - 215 = 36
36 ÷ 215 = 0.16744186046511628
0.16744186046511628 x 100 = 16.74%