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 |
| --- | --- | --- | --- | --- | --- |
| 2002 | 4 | USL PDL | 3rd, Mid Atlantic | Did not qualify | Did not qualify |
| 2003 | 4 | USL PDL | 1st, Mid Atlantic | Conference Semifinals | Did not qualify |
| 2004 | 4 | USL PDL | 3rd, Mid Atlantic | Did not qualify | Did not qualify |
| 2005 | 4 | USL PDL | 1st, Mid Atlantic | National Semifinals | 2nd Round |
| 2006 | 4 | USL PDL | 5th, Mid Atlantic | Did not qualify | Did not qualify |
| 2007 | 4 | USL PDL | 6th, Mid Atlantic | Did not qualify | Did not qualify |
| 2008 | 4 | USL PDL | 6th, Mid Atlantic | Did not qualify | Did not qualify |
Question:
what is the difference between the richmond futures kickers rank in 2003 and 2006?
Answer:
4