-6.18% is the change from 518 to 486
Calculation steps:
[( 486 - 518 ) ÷ 518] x 100 = -6.18%
Formula
Percentage change = [(486 - 518) / 518] x 100
Subtract the new number by the original number
486 - 518 = -32
-32 ÷ 518 = -0.06177606177606178
-0.06177606177606178 x 100 = -6.18%