-21.62% is the change from 518 to 406
Calculation steps:
[( 406 - 518 ) ÷ 518] x 100 = -21.62%
Formula
Percentage change = [(406 - 518) / 518] x 100
Subtract the new number by the original number
406 - 518 = -112
-112 ÷ 518 = -0.21621621621621623
-0.21621621621621623 x 100 = -21.62%