-99.61% is the change from 510 to 2
Calculation steps:
[( 2 - 510 ) ÷ 510] x 100 = -99.61%
Formula
Percentage change = [(2 - 510) / 510] x 100
Subtract the new number by the original number
2 - 510 = -508
-508 ÷ 510 = -0.996078431372549
-0.996078431372549 x 100 = -99.61%