-31.58% is the change from 19 to 13
Calculation steps:
[( 13 - 19 ) ÷ 19] x 100 = -31.58%
Formula
Percentage change = [(13 - 19) / 19] x 100
Subtract the new number by the original number
13 - 19 = -6
-6 ÷ 19 = -0.3157894736842105
-0.3157894736842105 x 100 = -31.58%