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:
| # | Wrestlers | Reign | Date | Days\nheld | Location | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Kuishinbo Kamen | 1 | January 4, 2001 | 758 | Osaka, Japan | Kamen defeated Ebessan to become the first champion. |
| 2 | Ebessan | 1 | February 1, 2003 | 56 | Osaka, Japan |  |
| 3 | Pero | 1 | March 29, 2003 | 7 | Osaka, Japan |  |
| 4 | Ebessan | 2 | April 5, 2003 | 92 | Osaka, Japan |  |
| 5 | Tigers Mask | 1 | July 6, 2003 | 90 | Osaka, Japan |  |
| — | Vacant | — | October 4, 2003 | — | N/A | Tigers Mask vacated the title to enter the Tennozan 2003 tournament. |
| 6 | Miracle Man | 1 | December 7, 2003 | 55 | Osaka, Japan | Miracle Man won a 4-Way Match which included Ebessan, Kuishinbo Kamen, and Pero to win the vacant championship. |
| 7 | Ebessan | 3 | January 31, 2004 | 21 | Osaka, Japan |  |
| 8 | Kuishinbo Kamen | 2 | February 21, 2004 | 665 | Osaka, Japan |  |
| — | Stripped | — | December 17, 2005 | — | N/A | Kamen was stripped of the title due to a lack of title defenses. |
| 9 | Policeman | 1 | February 18, 2006 | 311 | Osaka, Japan |  |
| 10 | Okita-kun | 1 | February 26, 2006 | 314 | Osaka, Japan | Okita-kun won an Eight-Man Battle Royal last eliminating Policeman. |
| — | Vacant | — | January 6, 2007 | — | N/A | Okita-hun vacated the title due to an ear injury on September 16, 2009 |
| 11 | Sgt. Suchi | 1 | February 12, 2007 | 194 | Osaka, Japan | Sgt. Suchi is a comedian who won a Battle Royal, last eliminating Miracle Man and Kuishinbo Kamen. |
| 12 | Ebessan III | 1 | August 25, 2007 | 113 | Osaka, Japan |  |
| 13 | Kuishinbo Kamen | 3 | December 16, 2007 | 84 | Tokyo, Japan |  |
| 14 | Miracle Man | 2 | March 9, 2008 | 51 | Tokyo, Japan |  |
| 15 | Kanjyuro Matsuyama | 1 | April 29, 2008 | 0 | Tokyo, Japan | Matsuyama retires the title immediately after the match and declares himself the first Osaka Pro Wrestling Owarai Champion. |
| 16 | Kuishinbo Kamen | 4 | April 29, 2010 | 59 | Osaka, Japan | Kamen wins both the Owarai Championship and the re-activated Osaka Meibutsu Sekaiichi Championship. |
| 17 | Kyusei Ninja Ranmaru | 1 | June 27, 2010 | 22 | Osaka, Japan | Ranmaru wins both titles. |
| 18 | Kuishinbo Kamen | 5 | July 19, 2010 | 1435+ | Osaka, Japan | Kamen wins both titles. |
Question:
how many matches were in 2007?
Answer:
4