I heard (I believe on a BMW video about the assembly plant) that there are only a handful of cars produced each year with identical configurations. Taking into account paint color, enterior color and various options the potential number of configurations is quite large.
2010 E93 335i M LeMans Blue
2001 E 46 330ci Coupe/silver/black/Sunroof
1999 BMW R1200C Cruiser-Ivory & Blue