From BMW Group PressClub USA:

MINI Brand Sales

MINI USA reported sales of 3,999 automobiles in September. The September 2011 sales are down 18.1% from the 4,884 sold in September, 2010.

Year-to-date, MINI sales in the U.S. are up 20.4% on volume of 41,635 compared to 34,588 in the first nine months of 2010.

September 2011 September 2010 change year-to-date 2011 year-to-date 2010 change
3,999 4,884 -18.1% 41,635 34,588 20.4%

See MINI sales in the USA by month.