-55.32% is the change from 517 to 231
Calculation steps:
[( 231 - 517 ) ÷ 517] x 100 = -55.32%
Formula
Percentage change = [(231 - 517) / 517] x 100
Subtract the new number by the original number
231 - 517 = -286
-286 ÷ 517 = -0.5531914893617021
-0.5531914893617021 x 100 = -55.32%