-94.51% is the change from 819 to 45
Calculation steps:
[( 45 - 819 ) ÷ 819] x 100 = -94.51%
Formula
Percentage change = [(45 - 819) / 819] x 100
Subtract the new number by the original number
45 - 819 = -774
-774 ÷ 819 = -0.945054945054945
-0.945054945054945 x 100 = -94.51%