-82.47% is the change from 519 to 91
Calculation steps:
[( 91 - 519 ) ÷ 519] x 100 = -82.47%
Formula
Percentage change = [(91 - 519) / 519] x 100
Subtract the new number by the original number
91 - 519 = -428
-428 ÷ 519 = -0.8246628131021194
-0.8246628131021194 x 100 = -82.47%