-45.05% is the change from 819 to 450
Calculation steps:
[( 450 - 819 ) ÷ 819] x 100 = -45.05%
Formula
Percentage change = [(450 - 819) / 819] x 100
Subtract the new number by the original number
450 - 819 = -369
-369 ÷ 819 = -0.45054945054945056
-0.45054945054945056 x 100 = -45.05%