NPD Group released its numbers today for December and all of 2011, and well, it capped off what was largely an ugly year in the physical software business. In December, total industry sales dropped by 21% to $3.99 billion compared to last December's $5.07 billion. Hardware was down 28% and software dipped by 14%. This certainly didn't help the year-end total for 2011, which came to $17.02 billion, down 8% from 2010's $18.59 billion. For the full year, hardware and accessories were each down 11% and software declined six percent.