-99.5% is the change from 601 to 3
Calculation steps:
[( 3 - 601 ) ÷ 601] x 100 = -99.5%
Formula
Percentage change = [(3 - 601) / 601] x 100
Subtract the new number by the original number
3 - 601 = -598
-598 ÷ 601 = -0.9950083194675541
-0.9950083194675541 x 100 = -99.5%