The OECD released an extensive report about foreign bribery early December. According to the report, more than 427 cases were dealt with justice since 1999, when the organization launched its convention.
It looks like public mandates (27%) and customs (11%) are the most targeted.
Link : http://www.oecd.org/daf/oecd-foreign-bribery-report-9789264226616-en.htm