RDF Datasets with provenance data

Dear Sir/Madam,
My name is Kay Mueller and I am a researcher at the University of
Leipzig. Currently we are planing to evaluate whether it is feasible to
store provenance and meta data for each triple in a graph, hence we are
wondering whether you are aware of any dataset which either stores data
at the triple level or which could be converted into this format (e.g.
Yago, Wikidata).
We would be very grateful, if you could give us any pointers to
datasets, related work, etc.
Thank you very much in advance.
-- 
Kind regards / Mit freundlichem Gruß
Kay Müller
AKSW/KILT <http://aksw.org/Groups/KILT.html>
 Office: InfAI e.V., Hainstr. 11, Room 101a, 04109 Leipzig, Germany
Homepage: http://aksw.org/KayMueller.html
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