-97.68% is the change from 517 to 12
Calculation steps:
[( 12 - 517 ) ÷ 517] x 100 = -97.68%
Formula
Percentage change = [(12 - 517) / 517] x 100
Subtract the new number by the original number
12 - 517 = -505
-505 ÷ 517 = -0.97678916827853
-0.97678916827853 x 100 = -97.68%