-45.2% is the change from 823 to 451
Calculation steps:
[( 451 - 823 ) ÷ 823] x 100 = -45.2%
Formula
Percentage change = [(451 - 823) / 823] x 100
Subtract the new number by the original number
451 - 823 = -372
-372 ÷ 823 = -0.4520048602673147
-0.4520048602673147 x 100 = -45.2%