-99.6% is the change from 506 to 2
Calculation steps:
[( 2 - 506 ) ÷ 506] x 100 = -99.6%
Formula
Percentage change = [(2 - 506) / 506] x 100
Subtract the new number by the original number
2 - 506 = -504
-504 ÷ 506 = -0.9960474308300395
-0.9960474308300395 x 100 = -99.6%