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 | Reg. Season | Playoffs | Open Cup |
| --- | --- | --- | --- | --- | --- |
| 1998 | 3 | USISL D-3 Pro League | 3rd, Northeast | Division Semifinals | 2nd Round |
| 1999 | 3 | USL D-3 Pro League | 1st, Northern | Champion | Did not qualify |
| 2000 | 3 | USL D-3 Pro League | 5th, Northern | Conference Finals | Did not qualify |
| 2001 | 3 | USL D-3 Pro League | 7th, Northern | Did not qualify | Did not qualify |
| 2002 | 3 | USL D-3 Pro League | 1st, Northern | Quarterfinals | Did not qualify |
| 2003 | 3 | USL Pro Select League | 3rd, Northern | Did not qualify | Did not qualify |
| 2004 | 3 | USL Pro Soccer League | 3rd, Northern | Did not qualify | 2nd Round |
| 2005 | 3 | USL Second Division | 1st | Final | 3rd Round |
| 2006 | 3 | USL Second Division | 6th | Did not qualify | Did not qualify |
| 2007 | 3 | USL Second Division | 6th | Did not qualify | 2nd Round |
| 2008 | 3 | USL Second Division | 6th | Quarterfinals | 2nd Round |
| 2009 | 3 | USL Second Division | 7th | Did not qualify | 2nd Round |
| 2010 | 4 | USL PDL | 6th, Northeast | Did not qualify | Did not qualify |
| 2011 | 4 | USL PDL | 3rd, Northeast | Did not qualify | 1st Round |
| 2012 | 4 | USL PDL | 3rd, Northeast | Did not qualify | Did not qualify |
| 2013 | 4 | USL PDL | 4th, Northeast | Did not qualify | Did not qualify |
Question:
what is the total amount of usl pdl leagues?
Answer:
4