-99.5% is the change from 399 to 2
Calculation steps:
[( 2 - 399 ) ÷ 399] x 100 = -99.5%
Formula
Percentage change = [(2 - 399) / 399] x 100
Subtract the new number by the original number
2 - 399 = -397
-397 ÷ 399 = -0.9949874686716792
-0.9949874686716792 x 100 = -99.5%