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

full_context: Document 1: Barbara Freethy: Barbara Freethy (born in California) is a #1 New York Times bestselling American author of women's fiction, contemporary romance and romantic suspense. She is a two-time winner of Romance Writers of America's RITA Award for Best Contemporary Single Title Romance for "Daniel's Gift" in 1997, and for Best Contemporary Single Title Romance for "The Way Back Home" in 2013. She has sold over 5 million books, with 18 books making the New York Times bestseller list. In 2014, she was named the Amazon KDP Bestselling Author of All Time.
Document 2: 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.
Document 3: Catherine Mann: Catherine Mann is a USA Today bestselling author who has published numerous books with Berkley, Sourcebooks, and Harlequin Desire. Catherine has won a Rita Award, a Romantic Times Reviewer's Choice Award, a Booksellers' Best Award, and celebrated six RITA Award finals.
Document 4: Anne Gracie: Anne Gracie is an award winning Australian author of historical romance novels. Her books have been shortlisted for RITA Award and she has twice won the Australian Romance Writer of the Year award and National Readers Choice Award (USA). She lives in Melbourne, Victoria.
Document 5: Nancy Warren (author): Nancy Warren is a Pacific Northwest author of contemporary romance novels. She received her first publication contract after winning Harlequin's 2000 Summer Blaze contest. Since then, she has released 30 novels and novellas, been twice nominated for the Romance Writers of America's RITA Award, and won a "Romantic Times" Reviewers' Choice Award.
Document 6: 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".
Document 7: 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.
Document 8: 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.
Document 9: Caroline Linden: Caroline Linden is an American author of historical and contemporary romance. She won Romance Writers of America RITA Award for Best Romance Novella in 2012 for "I Love the Earl", making it the first digital-first publication to win this award. Her books have been translated into eleven foreign languages.
Document 10: 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.
Document 11: 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.
Document 12: RITA Award: The RITA Award is the most prominent award given throughout the genre of romance fiction. It is presented by Romance Writers of America (RWA). The purpose of the RITA Award is to promote excellence in the romance genre by recognizing outstanding published novels and novellas. It is named for the RWA's first president, Rita Clay Estrada.
Document 13: The Night Watch (Waters novel): The Night Watch is a dark, 2006 historical fiction novel by Sarah Waters. It was shortlisted for the 2006 Man Booker Prize and shortlisted for the 2006 Orange Prize. The novel, which is told backward through third person narrative, takes place in 1940s London during and after World War II. The storyline follows the fragmented lives and the strange interconnections between Kay, Helen and Julia, three lesbians, Viv, a straight woman and Duncan, her brother, a gay man - their secrets, shames and scandals. The war, with its never ending night watches serves as a horrifying context, backdrop and metaphor as a constant reminder of the morbidity that surrounds life and love.
Document 14: Hannah Fielding: Hannah Fielding is an award-winning contemporary Romance fiction writer. Her second book, "The Echoes of Love", won a 2014 Gold IPPY Award for Romance and the Silver Medal for Romance at the 2014 Foreword Reviews IndieFab Book Awards. Her third novel, "Indiscretion", was named the Gold Winner in the Fiction: Romance Category of the 2015 USA Best Book Awards. It also won Gold at the 2016 Benjamin Franklin Awards. "Indiscretion" is the first novel in the "Andalucian Nights Trilogy". The second part, "Masquerade", was published in 2015 as well, and the third part, "Legacy" was published in summer 2016.
Document 15: 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.
ground_truth: 2011