-54.85% is the change from 999 to 451
Calculation steps:
[( 451 - 999 ) ÷ 999] x 100 = -54.85%
Formula
Percentage change = [(451 - 999) / 999] x 100
Subtract the new number by the original number
451 - 999 = -548
-548 ÷ 999 = -0.5485485485485485
-0.5485485485485485 x 100 = -54.85%