-44.58% is the change from 821 to 455
Calculation steps:
[( 455 - 821 ) ÷ 821] x 100 = -44.58%
Formula
Percentage change = [(455 - 821) / 821] x 100
Subtract the new number by the original number
455 - 821 = -366
-366 ÷ 821 = -0.4457978075517661
-0.4457978075517661 x 100 = -44.58%