Appreciation: Condo vs Co-op

[Andrew McNulty]

Can anyone point me in the direction of analytics showing the appreciation of similar sized condos and coops in the New York area for the past 30-50 years?  It seems that condos have appreciated greater simply due to having a larger supply of buyers by not having the restrictions, but I would think that the exclusivity of coops would compensate by creating a superior environment for owners, making it a more desirable place to live.  I'm curious if condos have always outpaced coops or if maybe the recent disparity comes from the influx of foreign investment?