Negative numbers in a pie chart? I don't think so!
Also, if you want to show a trend (year on year) then a pie chart isn't your man. Pie charts (if you use them at all, but that's another story) are standalones, for parts-of-a-whole, such as a breakdown of your customer base between domestic and export, for example.
I would keep it simple and use a line graph for what you're trying to show, with one line for turnover and another for P&L