-36.1% is the change from 518 to 331
Calculation steps:
[( 331 - 518 ) ÷ 518] x 100 = -36.1%
Formula
Percentage change = [(331 - 518) / 518] x 100
Subtract the new number by the original number
331 - 518 = -187
-187 ÷ 518 = -0.361003861003861
-0.361003861003861 x 100 = -36.1%