-54.04% is the change from 990 to 455
Calculation steps:
[( 455 - 990 ) ÷ 990] x 100 = -54.04%
Formula
Percentage change = [(455 - 990) / 990] x 100
Subtract the new number by the original number
455 - 990 = -535
-535 ÷ 990 = -0.5404040404040404
-0.5404040404040404 x 100 = -54.04%