The Chinese People's Daily Online (English version) reported:
The Calabria-based mafia organisation made 36 billion euros (43.6 US dollars) last year, Italian media reported on Sunday.
The report by Italian social research institute Eurispes said the criminal revenue in 2004 equalled 3.4 percent of Italian GDP.
Drug trafficking was the organisation's most profitable business, generating 22.3 billion euros (26.7 billion dollars), Eurispes said.
Skimming off money from public works contracts and general business corruption were the next most lucrative activities, netting the group more than 4.7 billion euros (5.7 billion dollars) .
Prostitution and arms trafficking made the 'Ndrangheta an estimated 4.6 billion (5.6 billion dollars) while extortion and loan-sharking brought in 4.1 billion (4.9 billion dollars), the report said.
It stressed that the 'Ndrangheta's grip on the southern region was having a devastating social impact.
The Calabria is a region in southern Italy which occupies the "toe" of the Italian peninsula south of Naples. The Calabrian organized criminals are referred to as 'Ndrangheta (from the Greek word andragathía for heroism and virtue).