how does the avg return of REITs compare to stocks

I'm looking to diversify a bit and was wondering how "in the long run" what is the return for REITs?

Are they 10% like the stock mkt?

There is a REIT etf REM, what is the avg return of that?

 

http://library.ameriprise.com/srl/amp/library_article.jsp?tid=1375

 

wow, I didn't know REITs performed that well at all. Thank you for that article.

Do you know a good source of equity REITs?