3.69% is the change from 406 to 421
Calculation steps:
[( 421 - 406 ) ÷ 406] x 100 = 3.69%
Formula
Percentage change = [(421 - 406) / 406] x 100
Subtract the new number by the original number
421 - 406 = 15
15 ÷ 406 = 0.03694581280788178
0.03694581280788178 x 100 = 3.69%