MINI has released some sales figures for the first nine months of 2012 (January through September). Although not including every model, we do get some numbers for the MINI Countryman, MINI Coupé, and MINI Roadster. None have had two full years to get a true year-over-year comparison, however.
From BMW Group PressClub Global:
The total number of MINI brand vehicles sold during the first nine months of the year increased by 7.2% to 223,214 units (2011: 208,216 units). Sales of the MINI Countryman grew strongly again, rising by 21.2% to 75,119 units (2011: 61,986 units). The MINI Coupé achieved a sales volume of 8,877 units (2011: 249), while the keys to the MINI Roadster were handed over to 6,932 new customers.
October sales figures should be posted soon.