I started my book challenge in mid 2011 when I began reading ebooks challenging myself to read 50 of them but I did not meet it within the 12 months, but in one and a half years, I read 41 books. I was pretty motivated but thought I'd be more realistic and put my subsequent yearly challenge at 20 books, i.e. about 1-2 books a month which is more reasonable and workable.
However, I read 30 in 2013 and these 56 books this year, and I'm pretty proud of it. It's a good book year.