Well I guess that brings back up the controversy of BMW's win the last couple of years. The numbers are supposed to be for registered cars, as in actual owners. It seems BMW was caught with 10k less registered cars to owners as they were loaner/fleet cars.
For all intents and purposes yes this is for leased/sold cars to retail/fleet. I travel and rent cars quite a bit and you don't see Lexus being able to be rented, whereas BMW, Mercedes, Infiniti, Lincoln hell and now Porsche etc can be rented at Hertz and other rental companies. This brings up the retail sale vs fleet sale argument (I have no issue with fleet sales, someone obviously demands them).
Here is a list from 2011
Old article but still relevant today
http://www.bloomberg.com/bw/stories...siness-news-stock-market-and-financial-advice
From what people in the industry tell me BMW, Infiniti lease the most overall. Infiniti is the most price sensitive customer with leases. Lexus has risen with lease penetration in recent years but still much further behind.
I also find it to be a regional thing as well. In Atlanta leasing isn't as aggressive as it is in Miami where everyone seemingly has a luxury car and its because you can find all these under $400 a month deals for one. IMO takes quite a bit away from the "luxury" experience when the cars are so common.