Question: In what year did the actor who played Edward Snowden act in a movie with Heath Ledger and Julia Styles?

Context paragraphs:
Joseph Gordon-Levitt: Joseph Leonard Gordon-Levitt ( ; born February 17, 1981) is an American actor, filmmaker, singer and entrepreneur.  As a child, he appeared in the films "A River Runs Through It", "Angels in the Outfield" and "10 Things I Hate About You", and as Tommy Solomon in the TV series "3rd Rock from the Sun".  He took a break from acting to study at Columbia University, but dropped out in 2004 to pursue acting again.  He has since starred in "(500) Days of Summer", "Inception", "Hesher", "50/50", "Premium Rush", "The Dark Knight Rises", "Brick", "Looper", "The Lookout", "Manic", "Lincoln", "Mysterious Skin" and "".  He starred as Philippe Petit in the Robert Zemeckis-directed film "The Walk" (2015), and as Edward Snowden in the Oliver Stone film "Snowden" (2016).  For his leading performances in "(500) Days of Summer" and "50/50", he was nominated for the Golden Globe Award for Best Actor – Motion Picture Musical or Comedy.

State Theatre Centre of Western Australia: The State Theatre Centre of Western Australia is a theatre complex located within the Perth Cultural Centre in Perth, Western Australia.  The larger of three dedicated performance areas is known as the Heath Ledger Theatre in honour of Perth-born film actor Heath Ledger.

14th Empire Awards: The 14th Empire Awards ceremony (officially known as the Jameson Empire Awards), presented by the British film magazine "Empire", honored the best films of 2008 and took place on 29 March 2009 at the Grosvenor House Hotel in London, England.  During the ceremony, "Empire" presented Empire Awards in 12 categories as well as four honorary awards.  To celebrate the 20th year anniversary of "Empire" magazine a special honorary award was presented, the Actor of our Lifetime and to mark the loss of Heath Ledger, he was awarded the special honorary Heath Ledger Tribute Award.  The Sony Ericsson Soundtrack Award was renamed to "Best Soundtrack" and the Best Sci-Fi/Fantasy award was renamed this year only to "Best Sci-Fi/Superhero".  The Best Newcomer and Best Soundtrack awards were presented for the last time.  Irish comedian Dara Ó Briain hosted the show for the first time.  The awards were sponsored by Jameson Irish Whiskey for the first time.

Melissa Thomas: Mélissa Thomas is an Australian actress.  She is the daughter of the musician and record producer G. Wayne Thomas, (Morning of the Earth) and co-starred with Heath Ledger in the television series "Sweat" (1996) and has most recently been seen in the Heath Ledger episode of "E! True Hollywood Story" as herself, speaking frankly about life as his friend and co-star.  She has featured in a number of films and television series / mini-series over the years.

Statue of Edward Snowden: The statue of Edward Snowden, called Prison Ship Martyrs' Monument 2.0 by its creators, was an ephemeral, illegally installed public statue of Edward Snowden, an American whistleblower who leaked classified information from the National Security Agency (NSA) and was charged with federal crimes as a result.  The bronze-like statue was placed in Fort Greene Park in Fort Greene, Brooklyn, New York City, on April 6, 2015.  It was attached to a Doric column on the perimeter of the park's Prison Ship Martyrs' Monument, a memorial and crypt which honors and inters the more than 11,500 American prisoners of war who died in the American Revolution while housed on British prison ships.

No Place to Hide (Greenwald book): No Place to Hide: Edward Snowden, the NSA, and the U.S. Surveillance State is a 2014 non-fiction book by American investigative journalist Glenn Greenwald.  It was first published on May 13, 2014 through Metropolitan Books and details Greenwald's role in the global surveillance disclosures as revealed by the former National Security Agency contractor Edward Snowden.  The documents from the Snowden archive cited in the book are freely available online.

Verax (film): Verax is a five-minute 2013 short film about the Edward Snowden leaking event in Hong Kong.  Produced by amateur filmmakers in Hong Kong, it was posted to YouTube in June 2013.  The name of the film originates from Snowden's codename for himself, which means "truth teller" in Latin.  It was produced by the group J.Shot Videos.  According to the producers, this was the first film ever produced about Snowden.

10 Things I Hate About You: 10 Things I Hate About You is a 1999 American romantic comedy film directed by Gil Junger and starring Julia Stiles, Heath Ledger, Joseph Gordon-Levitt, and Larisa Oleynik.  The screenplay, written by Karen McCullah Lutz and Kirsten Smith, is a modernization of William Shakespeare's late-16th century comedy "The Taming of the Shrew", retold in a late-1990s American high school setting.  In the story, new student Cameron (Gordon-Levitt) is smitten with Bianca (Oleynik) and, in order to get around her father's strict rules on dating, attempts to get bad boy Patrick (Ledger) to date Bianca's ill-tempered sister, Kat (Stiles).  The film is titled after a poem written by Kat about her bittersweet romance with Patrick.  Much of the filming took place in the Seattle metropolitan area, with many scenes shot at Stadium High School in Tacoma.

Commentary on Edward Snowden's disclosure: Commentary on Edward Snowden's disclosure is part of the Reactions to global surveillance disclosures made by Edward Snowden.

The Joker (The Dark Knight): The Joker is a fictional supervillain from American comic book publisher DC Comics and the main antagonist in Christopher Nolan's 2008 superhero film "The Dark Knight".  He was portrayed by late Australian actor Heath Ledger.  Ledger's interpretation of the character is specifically influenced by the graphic novels "" and "".  In the film, he wears the character's traditional color palette, while his facial appearance includes clown makeup that covers facial scars of a Glasgow smile.

Supporting paragraphs: Joseph Gordon-Levitt 10 Things I Hate About You
Answer: 1999