-56.87% is the change from 990 to 427
Calculation steps:
[( 427 - 990 ) ÷ 990] x 100 = -56.87%
Formula
Percentage change = [(427 - 990) / 990] x 100
Subtract the new number by the original number
427 - 990 = -563
-563 ÷ 990 = -0.5686868686868687
-0.5686868686868687 x 100 = -56.87%