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 | 2 | USISL A-League | 1st, Pacific | Conference Finals | Did not qualify |
| 1999 | 2 | USL A-League | 1st, Pacific | Conference Finals | 3rd Round |
| 2000 | 2 | USL A-League | 2nd, Pacific | Conference Quarterfinals | 3rd Round |
| 2001 | 2 | USL A-League | 2nd, Western | Quarterfinals | 2nd Round |
| 2002–2010 | On Hiatus | On Hiatus | On Hiatus | On Hiatus | On Hiatus |
| 2011 | 4 | NPSL | 1st, West-Southern | Division Semifinals | Did not qualify |
| 2012 | 4 | NPSL | 1st, West-Southern | Division Semifinals | Did not qualify |
| 2013 | 4 | NPSL | 2nd, West-Southern | TBD | Did not qualify |
Question:
when did the usl a-league have conference finals?
Answer:
1999.0