-99.03% is the change from 515 to 5
Calculation steps:
[( 5 - 515 ) ÷ 515] x 100 = -99.03%
Formula
Percentage change = [(5 - 515) / 515] x 100
Subtract the new number by the original number
5 - 515 = -510
-510 ÷ 515 = -0.9902912621359223
-0.9902912621359223 x 100 = -99.03%