This link reports an 8% decline in JWs in 2001, from 1991. It would be interesting to compare the WTS figures for Canada with this article's.
http://www.speroforum.com/site/article.asp?PagePosition=1&idcategory=33&idsub=134&id=2243#commentstop
According to the 2005 WT service report, there are 109K publishers. I guess counting methods between the two surveys differ.