The US and China account for ~38% of BMW sales (with China taking a slight majority of that split).
Aren't most BMWs sold in the US made in the US, though? Germany does need a strong european market to keep its manufacturing sector healthy.
X3, X5 and X6 are made in the US. Everything else is made in Germany. The Xs account for a large percentage of BMWs sold here (way larger than in Europe), but still I wouldn't call it a majority.
I would be surprised if all the parts were made in the U.S.
Well they are sold everywhere around the world, not just in Europe. They are quite popular in Asia, for example.
Nobody down here in Australia: a frigging 3-series costs about $100k AUD.