-82.59% is the change from 517 to 90
Calculation steps:
[( 90 - 517 ) ÷ 517] x 100 = -82.59%
Formula
Percentage change = [(90 - 517) / 517] x 100
Subtract the new number by the original number
90 - 517 = -427
-427 ÷ 517 = -0.8259187620889749
-0.8259187620889749 x 100 = -82.59%