This data is provided by the American Library Association, from Jan. 1, 2013 to Aug. 6, 2014.  It represents reported challenges, and does not for those that go unreported.

Found at: http://www.huffingtonpost.com/2014/09/22/banned-books-week-infographic_n_5852234.html?utm_hp_ref=books&ncid=fcbklnkushpmg00000028