So I think these are more or less the average US sales numbers:
3-series: 275/day.
7-series: 30/day
Z4: 10/day
1M: 2/day (one year limited production)
M3 lime rock: 0.5/day (one year limited production)
Dare we conclude that the Z4-model, the most beautiful BMW currently on offer, is also the most limited production model of the current non-limited production BMW models? It seems even the 6-series is selling better this year...