Cosa Nostra is under a legal barrage, and have been for the last odd decade or so. This took a serious bite out of their earnings. And the Camorristi are too busy killing each other.

Despite it, both groups regularly make more then US LCN interests could hope for. Its the Ndrangheta that are estimated to have made some 43 billion euro's in 2007, 3% of Italys GDP though. Out of the 9% total various mafia interests are estimated to have accounted for that year, that leaves 6% to split between the the other two, assuming the Apulians account for even half a percent (I think Im being generous)

So they all make way more, but the Calabrians seem to be making that much more then the rest.

Sacra Corona do alright but dont really count on the same scale. There's not enough of them. If you are going to talk about them, you might as well mention the Basilichi of Basilicata and the old Mala Del Brenta of Veneto, since they'd account for such as small portion.