The AAP have released the sales figrues for the US book amrket for 2010, as well as specific data on Sales in December2010. Sales in November were around $47 million, so the small difference between November and December matches last year's pattern, which saw sales of $18.3m and $18.7m in November and December, respectively.
E-books grew a dramatic +164.8 percent in December 2010 vs the previous year ($49.5 Million vs $18.7M). In the AAP’s ninth year of tracking this category, E-books once again increased significantly on an annual basis, up +164.4 percent for 2010 vs 2009 ($441.3M vs $166.9M). E-book sales represented 8.32 percent of the trade book market in 2010 vs 3.20 percent the previous year. A chart tracking nine years of E-book sales is included below.
The really interesting part is tracking the monthly ebook sales figures against the market as a whole. I'm still plotting my graphs, and I'll comment on it later.
BTW, this isn't the actual total sales, just the ones reported to the AAP. Not all publishers are members, nor do they all report in a timely manner. Also, ebook apps aren't included yet.