Hi, it certainly depends a great deal on which country the sponsored person is coming from.
In a recent article in the Toronto Star many refusal figures were quoted:
The refusal rate for spousal visas in Hong Kong last year was 48%
Through the Accra office 46%
Bejing office 20%
Islamabad 15%
New Delhi 14%
Manila 9%
You can read this article and see more refusal rates at this site:
http://www.thestar.com/article/658649Hope this helps,
Regards,
Raymond.