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:
| Season | Tier | Division | Place |
| --- | --- | --- | --- |
| 2005/06 | 5 | 1ª Aut. Pref. | — |
| 2006/07 | 4 | 3ª | 19th |
| 2007/08 | 5 | 1ª Aut. Pref. | 2nd |
| 2008/09 | 4 | 3ª | 18th |
| 2009/10 | 5 | 1ª Aut. Pref. | 3rd |
| 2010/11 | 5 | 1ª Aut. Pref. | 9th |
| 2011/12 | 5 | 1ª Aut. Pref. | 8th |
| 2012/13 | 5 | 1ª Aut. Pref. | 11th |
| 2013/14 | 5 | 1ª Aut. Pref. | — |
Question:
what is the lowest tier season to season?
Answer:
4