| Year | Visitors |
|---|---|
| 2019 | 841,516 |
| 2018 | 787,404 |
| 2017 | 716,604 |
| 2016 | 585,635 |
| 2015 | 589,155 |
| 2014 | 554,560 |
| 2013 | 549,599 |
| 2012 | 542,527 |
| 2011 | 536,006 |
| 2010 | 600,897 |
| 2009 | 528,865 |
| 2008 | 618,285 |
| 2007 | 582,675 |
| 2006 | 537,250 |
| 2005 | 632,521 |
| 2004 | 546,312 |
| 2003 | 615,269 |
| 2002 | 492,785 |
| 2001 | 492,745 |
| 2000 | 444,402 |
| 1999 | 391,694 |
| 1998 | 374,378 |
| 1997 | 378,977 |