-36.84% is the change from 19 to 12
Calculation steps:
[( 12 - 19 ) ÷ 19] x 100 = -36.84%
Formula
Percentage change = [(12 - 19) / 19] x 100
Subtract the new number by the original number
12 - 19 = -7
-7 ÷ 19 = -0.3684210526315789
-0.3684210526315789 x 100 = -36.84%