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 | Character | Title | Author | Artist | Imprint |
| --- | --- | --- | --- | --- | --- |
| 2005.0 | I | Zaregoto series | Nisio Isin | Take | Kodansha Novels |
| 2006.0 | I | Zaregoto series | Nisio Isin | Take | Kodansha Novels |
| 2007.0 | Mikoto Sayama | Owari no Chronicle (Ahead series) | Minoru Kawakami | Satoyasu | Dengeki Bunko |
| 2008.0 | Sousuke Sagara | Full Metal Panic! | Shoji Gatoh | Shikidouji | Fujimi Fantasia Bunko |
| 2009.0 | Hideyoshi Kinoshita | Baka to Test to Shōkanjū | Kenji Inoue | Yui Haga | Famitsu Bunko |
| 2010.0 | Hideyoshi Kinoshita | Baka to Test to Shōkanjū | Kenji Inoue | Yui Haga | Famitsu Bunko |
| 2011.0 | Tōma Kamijō | Toaru Majutsu no Index | Kazuma Kamachi | Kiyotaka Haimura | Dengeki Bunko |
| 2012.0 | Kazuto Kirigaya / Kirito | Sword Art Online | Reki Kawahara | Abec | Dengeki Bunko |
| 2013.0 | Kazuto Kirigaya / Kirito | Sword Art Online | Reki Kawahara | Abec | Dengeki Bunko |
Question:
what is the earliest year when the author is reki kawahara?
Answer:
2012.0