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:
| Name | Club | Date of departure | Replacement | Date of appointment |
| --- | --- | --- | --- | --- |
| Jadet Meelarp | Chonburi | January 2009 | Kiatisuk Senamuang | January 2009 |
| Kiatisuk Senamuang | Chula United | January 2009 | Carlos Ferreira | January 2009 |
| Prajuk Viengsong | TTM Samut Sakhon | January 2009 | Attaphol Puspakom | January 2009 |
| Attaphol Puspakom | TTM Samut Sakhon | April 2009 | Kij Meesrisuk | April 2009 |
| Surasak Tansurat | Muangthong United | April 2009 | Attaphol Puspakom | April 2009 |
| Prapol Pongpanich | PEA | May 2009 | Thongsuk Sampahungsith | May 2009 |
| Hans R. Emser | Bangkok Glass | June 2009 | Surachai Jaturapattarapong | June 2009 |
| Pansak Ketwattha | Pattaya United | June 2009 | Wisoon Wichaya | June 2009 |
| Christophe Larrouilh | BEC Tero Sasana | June 2009 | Tawan Sripan | June 2009 |
| Wisoon Wichaya | Pattaya United | June 2009 | Jadet Meelarp | June 2009 |
| Carlos Ferreira | Chula United | August 2009 | Pichai Pituwong | August 2009 |
| Kij Meesrisuk | TTM Samut Sakhon | August 2009 | Prajuk Viengsong | August 2009 |
| Chatchai Paholpat | Nakhon Pathom | September 2009 | Piyapong Pue-on | September 2009 |
Question:
how many managerial changes were there in 2009?
Answer:
13