No, I don't have any statistics on that. There are certainly people who use legal aid more than once. Generally speaking, if they're people who are facing charges and have previously faced charges, they're likely at a significantly increased risk of incarceration as a penalty. Therefore, they are significantly more likely to receive legal aid and, in the view of many people, significantly more in need of legal aid.
On October 31st, 2006. See this statement in context.