Question: When did Sherry Thomas receive the Romance Writers of America RITA Award for Best Historical Romance?

Context paragraphs:
Nicole Jordan: Nicole Jordan (born 1954 in Oklahoma) is a best-selling American author of romance novels.  Jordan's historical romances have appeared on numerous best-seller lists, including the New York Times, USA Today, Waldenbooks, and Amazon.com list.  She has been a finalist for the Romance Writers of America RITA Award as well as a runner-up for RWA's Favorite Book of the Year.  Jordan has also been awarded the Dorothy Parker Award of Excellence for best historical.  Jay Leno pretended to read aloud her novel "Touch Me With Fire" during a skit on The Tonight Show.

Not Quite a Husband: Not Quite a Husband is a historical romance by Sherry Thomas.  It won the Romance Writers of America RITA Award for Best Historical Romance in 2010.

Sherry Thomas: Sherry M. Thomas (born 1975) is an American novelist of young adult fantasy, historical romance, and contemporary romance.  She has won multiple awards including the Romance Writers of America RITA Award for Best Historical Romance for "Not Quite a Husband" in 2010 and "His at Night" in 2011.  Most best-of-romance lists include one of her titles.

Lorraine Heath: Lorraine Heath is a New York Times and USA Today bestselling American author of contemporary romance, historical romance, paranormal romance and young adult novels under multiple pen names, including Rachel Hawthorne, J.A. London, and Jade Parker.  She is known for her "beautiful, deeply emotional romances" and in 1997, she received the Romance Writers of America RITA Award for Best Short Historical Romance for her novel "Always to Remember".  As of June 2015, fifteen of her titles made the "USA Today" bestseller list.

Tessa Dare: Tessa Dare is a New York Times and USA Today bestselling American historical romance novelist.  She has authored fifteen novels and novellas and created four different series.  In 2012, she won the prestigious Romance Writers of America RITA award for Best Regency Historical Romance for her book "A Night to Surrender".

Linda Barlow: Linda Ruth Barlow is an American author of contemporary romance, historical romance, general fiction, thriller, and romantic suspense.  She has won numerous industry awards, including the 1989 Romance Writers of America RITA Award for Best Single Title Romance for her novel "Leaves of Fortune", Romantic Times' Best New Historical Novelist of 1986, and a Lifetime Achievement award from Romantic Times.  She is also vice president of Monash Research, an IT consultant firm.

Eileen Dreyer: Eileen Dreyer is a New York Times bestselling American author of contemporary romance, historical romance and suspense and also publishes under the pen name Kathleen Korbel.  She is a five-time winner of the Romance Writers of America RITA Award and in 1995 was inducted into the Romance Writers of America Hall of Fame.  In 2014, she competed on the TV game show Jeopardy!.

Jaclyn Reding: Jaclyn Reding (born March 23 in Ohio, United States) is an American writer of historical romance novels.  She has been a Golden Quill Awards winner and the author of an Amazon.com's #1 bestseller.  She also is a National Readers' Choice Awards finalist and has received a nomination for the Romance Writers of America RITA Award.

Sarah MacLean: Sarah MacLean (born December 17, 1978) is a New York Times bestselling American author of young adult novels and romance novels.  Her first adult romance novel, "Nine Rules to Break When Romancing a Rake" debuted on the New York Times Bestseller List, where it stayed for four weeks.  Since then, all of her adult romance novels have been on the New York Times and USA Today bestseller lists.  Since February 2014, MacLean has written a monthly romance novel review column for The Washington Post.  She is a two-time winner of the Romance Writers of America RITA Award for Best Historical Romance for "A Rogue by Any Other Name" in 2013 and "No Good Duke Goes Unpunished" in 2014.

His at Night: His at Night is a historical romance by Sherry Thomas.  It won the Romance Writers of America RITA Award for Best Historical Romance in 2011.

Supporting paragraphs: Sherry Thomas His at Night
Answer: 2011