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 Canada Cup |
| --- | --- | --- | --- | --- | --- |
| 2000.0 | 4.0 | USL PDL | 6th, Heartland | Did not qualify | Did not participate |
| 2001.0 | 4.0 | USL PDL | 4th, Heartland | Did not qualify | Did not participate |
| 2002.0 | 4.0 | USL PDL | 6th, Heartland | Did not qualify | Did not participate |
| 2003.0 | 4.0 | USL PDL | 4th, Heartland | Did not qualify | Did not participate |
| 2004.0 | 4.0 | USL PDL | 4th, Heartland | Did not qualify | Did not participate |
| 2005.0 | 4.0 | USL PDL | 4th, Heartland | Did not qualify | Did not participate |
| 2006.0 | 4.0 | USL PDL | 7th, Heartland | Did not qualify | Did not participate |
| 2007.0 | 4.0 | USL PDL | 1st, Heartland | Conference Semi-Finals | Did not participate |
| 2008.0 | 4.0 | USL PDL | 1st, Heartland | Champions | N/A |
| 2009.0 | 4.0 | USL PDL | 2nd, Heartland | Divisional Semi-Finals | N/A |
| 2010.0 | 4.0 | USL PDL | 1st, Heartland | National Final | N/A |
| 2011.0 | 4.0 | USL PDL | 1st, Heartland | National Semi-Finals | N/A |
| 2012.0 | 4.0 | USL PDL | 1st, Heartland | Conference Semi-Finals | N/A |
| 2013.0 | 4.0 | USL PDL | 1st, Heartland | National Final | N/A |
Question:
Which league's playoffs was national semi-finals?
Answer:
USL PDL