-5.63% is the change from 515 to 486
Calculation steps:
[( 486 - 515 ) ÷ 515] x 100 = -5.63%
Formula
Percentage change = [(486 - 515) / 515] x 100
Subtract the new number by the original number
486 - 515 = -29
-29 ÷ 515 = -0.05631067961165048
-0.05631067961165048 x 100 = -5.63%