The last time I looked at this in any great detail was in the summer. At that point they had 5,800 petitions that were open, so again, with the issue of context, of duplication, it is very difficult for the public, for members to find things. It needs a really good search functionality, which that site is not great for. Overall, there have been over 60,000 petitions that have been registered on the site, but at any one time you can have 5,000 or more that are open.
On November 25th, 2014. See this statement in context.