There were 464 challenges, as reported by the Office for Intellectual Freedom, American Library Association, in 2012.

This book was #2 on the list:

The Absolutely True Diary of a Part-Time Indian, by Sherman Alexie.
Reasons: Offensive language, racism, sexually explicit, unsuited for age group

Just so you know.

Frequently challenged books of the 21st century | ala.org/bbooks.