From a friend who watches this area of public policy, from a different viewpoint:
Even in the UK, a country with many years experience of developing intelligence and collating crime statistics extremely vague and contradictory estimates might be provided by government: ‘Total cost of economic and social harm caused to the UK by organised crime is estimated at between £20 billion and £40 billion each year.’ (Home Office, 2012).

There is similar vagueness over the numbers of published targets: in July 2011 this was c38,000 individuals involving around 6,000 criminal groups; in May 2012 it was c30,000 individuals and 7,000 groups!

Confusing things further, in 2009 the Cabinet Office had published estimated costs for different types of organised crime totalling £68.4 billion!

It is instructive to compare these estimates with those for the costs of tax avoidance (legal) and tax evasion (illegal) in the UK: tax avoidance costs the UK £25 billion a year; tax evasion £70 billion a year; and uncollected tax amounts to £27 billion to £28 billion.
Later figures from:http://www.taxresearch.org.uk/Blog/2...tax-realities/