-44.51% is the change from 820 to 455
Calculation steps:
[( 455 - 820 ) ÷ 820] x 100 = -44.51%
Formula
Percentage change = [(455 - 820) / 820] x 100
Subtract the new number by the original number
455 - 820 = -365
-365 ÷ 820 = -0.4451219512195122
-0.4451219512195122 x 100 = -44.51%