-81.37% is the change from 102 to 19
Calculation steps:
[( 19 - 102 ) ÷ 102] x 100 = -81.37%
Formula
Percentage change = [(19 - 102) / 102] x 100
Subtract the new number by the original number
19 - 102 = -83
-83 ÷ 102 = -0.8137254901960784
-0.8137254901960784 x 100 = -81.37%