-99.5% is the change from 398 to 2
Calculation steps:
[( 2 - 398 ) ÷ 398] x 100 = -99.5%
Formula
Percentage change = [(2 - 398) / 398] x 100
Subtract the new number by the original number
2 - 398 = -396
-396 ÷ 398 = -0.9949748743718593
-0.9949748743718593 x 100 = -99.5%