-18.04% is the change from 510 to 418
Calculation steps:
[( 418 - 510 ) ÷ 510] x 100 = -18.04%
Formula
Percentage change = [(418 - 510) / 510] x 100
Subtract the new number by the original number
418 - 510 = -92
-92 ÷ 510 = -0.1803921568627451
-0.1803921568627451 x 100 = -18.04%