4.25% is the change from 212 to 221
Calculation steps:
[( 221 - 212 ) ÷ 212] x 100 = 4.25%
Formula
Percentage change = [(221 - 212) / 212] x 100
Subtract the new number by the original number
221 - 212 = 9
9 ÷ 212 = 0.04245283018867924
0.04245283018867924 x 100 = 4.25%