-99.8% is the change from 991 to 2
Calculation steps:
[( 2 - 991 ) ÷ 991] x 100 = -99.8%
Formula
Percentage change = [(2 - 991) / 991] x 100
Subtract the new number by the original number
2 - 991 = -989
-989 ÷ 991 = -0.9979818365287588
-0.9979818365287588 x 100 = -99.8%