[Top100EbooksRank]

Pricewaterhouse Coopers is a multi billion dollar accounting company. A lot of businesses rely on them for their consultant expertise. I doubt they would be off so much when it come to "PAST" data:

2009: $500 mil
2010: $1,200 mil
2011: $2,696 mil ------out of $19.5 billion book market (print+ digital)





I did a quick growth rate projection from their data:

2009: $500 mil
2010: $1,200 mil (140% growth rate)
2011: $2,696 mil (125% growth rate)
2012: $4,326 mil (60% growth rate projection)
2013: $5,992 mil (39% growth rate projection)
2014: $7,653 mil (28% growth rate projection)
2015: $9,324 mil (22% growth rate projection)
2016; $10,905 mil (17% growth rate projection)