-99.5% is the change from 597 to 3
Calculation steps:
[( 3 - 597 ) ÷ 597] x 100 = -99.5%
Formula
Percentage change = [(3 - 597) / 597] x 100
Subtract the new number by the original number
3 - 597 = -594
-594 ÷ 597 = -0.9949748743718593
-0.9949748743718593 x 100 = -99.5%