From BMW Group PressClub USA:

MINI USA reported sales of 4,149 cars in June, an increase of 1.1 percent compared to last year.  MINI Convertible performed best and sales were up 35 percent compared to last year.  After the first six months, MINI continued to show a stable volume development with sales slightly up 0.3 percent to 20,953 cars while at the same time increasing its share of the small car premium segment that has lagged the general market trend.

June 2010 June 2009 change year-to-date 2010 year-to-date 2009 change
4,149 4,105 1.1% 20,953 20,885 0.3%

See MINI sales in the USA by month.