EU: European Commission: REPORT ON ACCESS TO DOCUMENTS
11 October 2014
"The frequency of invoking the protection of the Commission's decisionmaking process (Article 4(3)) as ground for refusal at the initial stage, in relation to all invoked exceptions, slightly increased in comparison with the previous year (27.1% against 25.2% in 2012). It was the most frequently invoked exception,..." [emphasis added and 16.3% of confirmatory applications are refused on the same grounds]
See:
Report on the application in 2013 of Regulation (EC) No 1049/2001 regarding public access to European Parliament, Council and Commission documents (pdf)
And see:
Annex - statistics (pdf)