-93.98% is the change from 515 to 31
Calculation steps:
[( 31 - 515 ) ÷ 515] x 100 = -93.98%
Formula
Percentage change = [(31 - 515) / 515] x 100
Subtract the new number by the original number
31 - 515 = -484
-484 ÷ 515 = -0.9398058252427185
-0.9398058252427185 x 100 = -93.98%