10.53% is the change from 19 to 21
Calculation steps:
[( 21 - 19 ) ÷ 19] x 100 = 10.53%
Formula
Percentage change = [(21 - 19) / 19] x 100
Subtract the new number by the original number
21 - 19 = 2
2 ÷ 19 = 0.10526315789473684
0.10526315789473684 x 100 = 10.53%