I am looking for a market valuation for "Retreats" in the US & Canada
for 2003-04 (and if possible, 2002) to learn about trending in the
'retreat' market: spiritual, corporate, self help, spas, etc.
What I'm specifically looking for is:
-aproximate total numbers of people going on retreats? (US/Canada) 
-is it a growing or diminishing number for 2002-04?
-how fast is it growing?
-what kind of trends are driving it?
-where do people tend to go on retreats? (mountain, desert,
countryside, oceanfront and/or key states/provinces?)
Thank you in advance.