-99.8% is the change from 990 to 2
Calculation steps:
[( 2 - 990 ) ÷ 990] x 100 = -99.8%
Formula
Percentage change = [(2 - 990) / 990] x 100
Subtract the new number by the original number
2 - 990 = -988
-988 ÷ 990 = -0.997979797979798
-0.997979797979798 x 100 = -99.8%