63.16% is the change from 19 to 31
Calculation steps:
[( 31 - 19 ) ÷ 19] x 100 = 63.16%
Formula
Percentage change = [(31 - 19) / 19] x 100
Subtract the new number by the original number
31 - 19 = 12
12 ÷ 19 = 0.631578947368421
0.631578947368421 x 100 = 63.16%