-90.17% is the change from 519 to 51
Calculation steps:
[( 51 - 519 ) ÷ 519] x 100 = -90.17%
Formula
Percentage change = [(51 - 519) / 519] x 100
Subtract the new number by the original number
51 - 519 = -468
-468 ÷ 519 = -0.9017341040462428
-0.9017341040462428 x 100 = -90.17%