A member over on M3forum.net has been compiling production statistics for M3's of the various body styles based on a script that pulls data from a BMW ETK database. I asked him to pull the same data for E39 M5s, some of you may find it of interest. For me it explains why it is challenging to find an Alpine/extended caramel interior M5. Here is what he has so far (data still needs some vetting):
He posted it to bimmerforums, I do not believe he is a member of this site currently.

He posted it to bimmerforums, I do not believe he is a member of this site currently.