I think the X5 ate way more of the X3's numbers. It is obvious X5s were flying off the shelf with incentives on the current X5 platform(before the F15 comes out)...so why would you buy an X3? For a few bucks more, you got more for your money with an X5. I would also be curious what part of the country bought the most X5s.
2015 BMW F25 35i M-Sport
Alpine White / M-Sport / Mocha Nevada /Fineline Anthracite / DHP / Adaptive LED / HK Sound / 20" 310M Run-Flats