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:
| Fiscal year | 2-car sets | 3-car sets | 4-car sets | 6-car sets | 8-car sets | Total vehicles |
| --- | --- | --- | --- | --- | --- | --- |
| 2005.0 | 70.0 | 10.0 | 40.0 | 46.0 | 12.0 | 702.0 |
| 2006.0 | 70.0 | 10.0 | 40.0 | 46.0 | 12.0 | 702.0 |
| 2007.0 | 66.0 | 10.0 | 51.0 | 44.0 | 6.0 | 678.0 |
| 2008.0 | 52.0 | 10.0 | 47.0 | 42.0 | 6.0 | 622.0 |
| 2009.0 | 37.0 | 10.0 | 42.0 | 41.0 | 5.0 | 558.0 |
| 2010.0 | 29.0 | 10.0 | 38.0 | 36.0 | 4.0 | 488.0 |
| 2011.0 | 28.0 | 10.0 | 31.0 | 34.0 | 3.0 | 438.0 |
Question:
Name the least 4 car sets
Answer:
31.0