According to the 2011 Annual Activity Report (p. 24-25) of the Commission’s Secretariat General, the European Parliament has asked 12.093 questions – 16 questions per member in average – to the European Commission in 2011, doubling the figures from 2007 (6066 at the time). 984 of these questions were so-called “priority questions” (3 weeks deadline instead of 6).

Because of the high number of questions, the Commission has introduced in 2011 a 20 line limit for written replies, it writes in the Activity Report. Still, the Commission managed to reply to only 62% of the normal questions and only 23% of the priority questions in time.

In case it’s of interest: Here’s the list of 2011 questions on the Parliament’s website. Here are the one’s from 2012.