I personally think that the registry is a valuable database that if maintained will serve the owners and future owners of our cars for many years to come and hence preserve the history of these great cars...to my way of thinking, the more value we place on the registry's data, the more likely the data integrity will be improved over time.
So, I do not see any problem with citing the stats in the database, but I do agree with a previous comment in this thread where, you can really only state "known examples" as we will never have a complete data set!
Speaking of the registry..Is it back up and running? I have been trying to get my car's details updated for over a year, and whilst I'm not complaining because the maintenance of the registry is supported by volunteers, based on my comments above, I for one would like to see the community of K code owners keep the data maintained.
Regards....Paul