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 | Division | League | Regular Season | Playoffs | Open Cup |
| --- | --- | --- | --- | --- | --- |
| 2003.0 | 4.0 | USL PDL | 3rd, Great Lakes | Did not qualify | Did not qualify |
| 2004.0 | 4.0 | USL PDL | 2nd, Great Lakes | Conference Semifinals | Did not qualify |
| 2005.0 | 4.0 | USL PDL | 4th, Great Lakes | Did not qualify | Did not qualify |
| 2006.0 | 4.0 | USL PDL | 6th, Great Lakes | Did not qualify | Did not qualify |
| 2007.0 | 4.0 | USL PDL | 7th, Great Lakes | Did not qualify | Did not qualify |
| 2008.0 | 4.0 | USL PDL | 4th, Midwest | Did not qualify | Did not qualify |
Question:
What's the highest division number through the years?
Answer:
4.0