There are 1,300 who chose citizenship. As far as immigration is concerned, it is not necessarily a choice. A number of people do not have a choice in part because they are permanent residents and can therefore not transfer citizenship. There are also certain countries that do not allow adoption in their country. The child therefore has to come to Canada and the adoption process has to be completed in Canada. This is true in quite a number of countries.
On December 14th, 2010. See this statement in context.