-97.17% is the change from 530 to 15
Calculation steps:
[( 15 - 530 ) ÷ 530] x 100 = -97.17%
Formula
Percentage change = [(15 - 530) / 530] x 100
Subtract the new number by the original number
15 - 530 = -515
-515 ÷ 530 = -0.9716981132075472
-0.9716981132075472 x 100 = -97.17%