-87.28% is the change from 519 to 66
Calculation steps:
[( 66 - 519 ) ÷ 519] x 100 = -87.28%
Formula
Percentage change = [(66 - 519) / 519] x 100
Subtract the new number by the original number
66 - 519 = -453
-453 ÷ 519 = -0.8728323699421965
-0.8728323699421965 x 100 = -87.28%