transposition about 50 thousand
http://www.google.com/search?source=ig&hl=en&rlz=&q=directiv...
However you have to consider the differences in meaning, because going blindly on numbers of hits is not a good idea:
Look at this from a UK gov site:
Transposition Table MiFID Level 2
www.fsa.gov.uk/pubs/policy/ttlevel2.pdf
File Format: PDF/Adobe Acrobat
Transposition Table: MiFID Implementing Directive. This table indicates, as at 26 July 2007, where we have transposed requirements of the MiFID implementing ...
You see you have both words. Transposition is the technical process by which a Directive is implemented into national law. However I think that what you want here is "implementation". As I said before, ask David, maybe he knows more than me, but I think I've answered questions from him in the past.