The Netflix series 13 Reasons Why shocked viewers with its graphic portrayal of sensitive subjects like rape, bullying, and suicide. The book it was based on was equally controversial. Jay Asher’s 2007 young adult novel of the same name was the most challenged or banned book last year, according to the American Library Association’s Office for Intellectual Freedom (OIF). Using information from the media as well as challenge reports, each year the OIF compiles a list of the previous year's top 10 most challenged books.

Since most requests to remove books from schools or libraries go unreported, these lists are not definitive; instead, they offer a “snapshot” of book challenges, according to the OIF. In recognition of Banned Books Week, which runs from September 23 through September 29, we’ve compiled a list of the most banned and challenged books of the past five years (2013 to 2017), including the years they were challenged and the reasons why.

1. Thirteen Reasons Why by Jay Asher

Year(s): 2017

Reason: Discussion of suicide

2. The Absolutely True Diary of a Part-Time Indian by Sherman Alexie

Year(s): 2013, 2014, 2017

Reason: Anti-family, cultural insensitivity, drugs/alcohol/smoking, gambling, offensive language, sex education, sexually explicit, violence, and “depictions of bullying”

3. Drama by Raina Telgemeier

Year(s): 2014, 2016, 2017

Reason: LGBT characters

4. The Kite Runner by Khaled Hosseini

Year(s): 2014, 2017

Reason: Sexual violence, unsuited to age group; was thought to “promote Islam”

5. George by Alex Gino

Year(s): 2016, 2017

Reason: Transgender child character

6. Sex is a Funny Word by Cory Silverberg and Fiona Smyth

Year(s): 2017

Reason: Addresses sex education; was thought to lead children to “want to have sex or ask questions about sex”

7. To Kill a Mockingbird by Harper Lee

Year(s): 2017

Reason: Violence and use of the N-word

8. The Hate U Give by Angie Thomas

Year(s): 2017

Reason: Drug use, profanity, offensive language

9. And Tango Makes Three by Peter Parnell, Justin Richardson, and Henry Cole

Year(s): 2014, 2017

Reason:Anti-family, homosexuality, political and religious viewpoints

10. I Am Jazz by Jessica Herthel, Jazz Jennings, and Shelagh McNicholas

Year(s): 2015, 2016, 2017

Reason: Addresses gender identity, homosexuality, sex education, religious viewpoint, unsuited to age group

11. This One Summer by Mariko Tamaki and Jillian Tamaki

Year(s): 2016

Reason: LGBT characters, drug use, profanity, sexually explicit content

12. Two Boys Kissing by David Levithan

Year(s): 2015, 2016

Reason: LGBT and sexually explicit content

13. Looking for Alaska by John Green

Year(s): 2013, 2015, 2016

Reason: Sexually explicit scene, unsuited to age group; was thought to lead students to “sexual experimentation”

14. Big Hard Sex Criminals by Matt Fraction and Chip Zdarsky

Year(s): 2016

Reason: Sexually explicit content

15. Make Something Up: Stories You Can’t Unread by Chuck Palahniuk

Year(s): 2016

Reason: Profanity and sexually explicit content; was called “disgusting and all around offensive”

16. Little Bill (series) by Bill Cosby and Varnette P. Honeywood

Year(s): 2016

Reason: Criminal sexual allegations against Bill Cosby

17. Eleanor & Park by Rainbow Rowell

Year(s): 2016

Reason: Offensive language

18. Fifty Shades of Grey by E. L. James

Year(s): 2013, 2015

Reason: Sexually explicit content, unsuited to age group; was also called “poorly written”

19. Beyond Magenta: Transgender Teens Speak Out by Susan Kuklin

Year(s): 2015

Reason: Offensive language, homosexuality, sex education, political and religious viewpoints, anti-family, unsuited to age group

20. The Curious Incident of the Dog in the Night-Time by Mark Haddon

Year(s): 2015

Reason: Profanity, religious viewpoint (atheism), unsuited to age group

21. The Holy Bible

Year(s): 2015

Reason: Religious viewpoint

22. Fun Home by Alison Bechdel

Year(s): 2015

Reason: Violence and graphic images

23. Habibi by Craig Thompson

Year(s): 2015

Reason: Nudity, sexually explicit content, unsuited to age group

24. Nasreen’s Secret School: A True Story from Afghanistan by Jeanette Winter

Year(s): 2015

Reason: Religious viewpoint, violence, unsuited to age group

25. Persepolis: The Story of a Childhood by Marjane Satrapi

Year(s): 2014

Reason: Gambling, offensive language, political viewpoint, graphic depictions; was called “politically, racially, and socially offensive”

26. The Bluest Eye by Toni Morrison

Year(s): 2013, 2014

Reason: Sexually explicit, unsuited to age group; was said to “contain controversial issues”

27. It’s Perfectly Normal by Robie Harris and Michael Emberley

Year(s): 2014

Reason: Nudity, sex education, sexually explicit

28. Saga by Brian Vaughan and Fiona Staples

Year(s): 2014

Reason: Anti-family, nudity, offensive language, sexually explicit, unsuited to age group

29. The Perks of Being a Wallflower by Stephen Chbosky

Year(s): 2013, 2014

Reason: Drugs/alcohol/smoking, homosexuality, offensive language, sexually explicit

30. A Stolen Life by Jaycee Dugard

Year(s): 2014

Reason: Drugs/alcohol/smoking, offensive language, sexually explicit, unsuited to age group

31. Captain Underpants (series) by Dav Pilkey

Year(s): 2013

Reason: Offensive language, violence, unsuited to age group

32. The Hunger Games by Suzanne Collins

Year(s): 2013

Reason: Religious viewpoint, unsuited to age group

33. A Bad Boy Can Be Good for A Girl by Tanya Lee Stone

Year(s): 2013

Reason: Drugs/alcohol/smoking, nudity, offensive language, sexually explicit content

34. Bless Me, Ultima by Rudolfo Anaya

Year(s): 2013

Reason: Drugs/alcohol/smoking, homosexuality, sexually explicit content, unsuited to age group

35. Bone (series) by Jeff Smith

Year(s): 2013

Reason: Political viewpoint, racism, violence