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 | National Champion | Score | Runner-Up | Host or site |
| --- | --- | --- | --- | --- |
| 2001 | UCLA | 5-4 | Stanford | Stanford University, Avery Aquatic Center, Stanford, California |
| 2002 | Stanford | 8-4 | UCLA | USC, McDonald's Swim Stadium, Los Angeles, California |
| 2003 | UCLA (2) | 4-3 | Stanford | UC San Diego, Canyonview Pool, San Diego, California |
| 2004 | USC | 10-8 | Loyola Marymount | Stanford University, Avery Aquatic Center, Stanford, California |
| 2005 | UCLA (3) | 3-2 | Stanford | University of Michigan, Canham Natatorium, Ann Arbor, Michigan |
| 2006 | UCLA (4) | 9-8 | USC | UC Davis, Schaal Aquatics Center, Davis, California |
| 2007 | UCLA (5) | 5-4 | Stanford | Long Beach State, Joint Forces Training Base, Los Alamitos, California |
| 2008 | UCLA (6) | 6-3 | USC | Stanford University, Avery Aquatic Center, Stanford, California |
| 2009 | UCLA (7) | 5-4 | USC | University of Maryland, Eppley Recreation Center Natatorium, College Park, Maryland |
| 2010 | USC (2) | 10-9 | Stanford | San Diego State, Aztec Aquaplex, San Diego, California |
| 2011 | Stanford (2) | 9-5 | California | University of Michigan, Canham Natatorium, Ann Arbor, Michigan |
| 2012 | Stanford (3) | 6-4 | USC | San Diego State, Aztec Aquaplex, San Diego, California |
| 2013 | USC (3) | 10-9 5OT | Stanford | Harvard University, Blodgett Pool, Cambridge, Massachusetts |
| 2014 |  |  |  | USC, Uytengsu Aquatics Center, Los Angeles, California |
Question:
how many years has stanford been national champion?
Answer:
3