Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Men's singles | Women's singles | Men's doubles | Women's doubles | Mixed doubles |
| --- | --- | --- | --- | --- | --- |
| 1999.0 | Marvin Steve | Maja Pohar | Dmitry Miznikov Valery Strelcov | Natalja Esipenko Natalia Golovkina | Valery Strelcov Natalia Golovkina |
| 2000.0 | Richard Vaughan | Anu Weckstrom | Michał Łogosz Robert Mateusiak | Felicity Gallup Joanne Muggeridge | Michael Beres Kara Solmudson |
| 2001.0 | Oliver Pongratz | Karina de Wit | Kristof Hopp Thomas Tesche | Erica van den Heuvel Nicole van Hooren | Peter Steffensen Lene Mork |
| 2002.0 | Przemysław Wacha | Petya Nedelcheva | Vincent Laigle Svetoslav Stoyanov | Tammy Jenkins Rhona Robertson | Russel Hogg Kirsteen McEwan |
| 2003.0 | Hendra Wijaya | Pi Hongyan | Vincent Laigle Svetoslav Stoyanov | Miyuki Tai Yoshiko Iwata | Carsten Mogensen Kamilla Rytter Juhl |
| 2004.0 | Hidetaka Yamada | Li Li | Daniel Glaser Dennis Von Dahn | Jiang Yanmei Li Li | Svetoslav Stoyanov Victoria Wright |
| 2005.0 | Holvy De Pauw | Miyo Akao | Simon Mollyhus Anders Kristiansen | Frances Liu Fan Shinta Mulia Sari | Hendra Wijaya Frances Liu Fan |
| 2006.0 | Andrew Smith | Petya Nedelcheva | Chris Tonks Chris Langridge | Liza Parker Jenny Day | Chris Langridge Jenny Day |
| 2007.0 | Carl Baxter | Guo Xin | Wouter Claes Frederic Mawet | Cai Jiani Guo Xin | Wouter Claes Nathalie Descamps |
| 2008.0 | Ville Lång | Kaori Imabeppu | Rupesh Kumar Sanave Thomas | Maria Thorberg Kati Tolmoff | Baptiste Careme Laura Choinet |
| 2009.0 | Peter Mikkelsen | Anita Raj Kaur | Mads Conrad-Petersen Mads Pieler Kolding | Ezgi Epice Claudia Vogelsang | Zvonimir Djurkinjak Stasa Poznanovic |
| 2010.0 | Ben Beckman | Nicole Grether | Joe Morgan James Phillips | Nicole Grether Charmaine Reid | Zvonimir Djurkinjak Stasa Poznanovic |
| 2011.0 | Dieter Domke | Minatsu Mitani | Kim Astrup Sorensen Rasmus Fladberg | Sandra-Maria Jensen Line Kjaersfeldt | Zvonimir Djurkinjak Stasa Poznanovic |
| 2012.0 | Lukas Schmidt | Kana Ito | Jacco Arends Jelle Maas | Samantha Barning Eefje Muskens | Jacco Arends Ilse Vaessen |
Question:
What's the first year that Guo Xin featured in women's singles?
Answer:
2007.0