| Year | Visitors |
|---|---|
| 2019 | 3,841,633 |
| 2018 | 4,107,520 |
| 2017 | 4,155,947 |
| 2016 | 4,084,298 |
| 2015 | 4,077,835 |
| 2014 | 3,767,287 |
| 2013 | 3,209,279 |
| 2012 | 3,267,124 |
| 2011 | 3,073,430 |
| 2010 | 3,072,716 |
| 2009 | 3,117,046 |
| 2008 | 3,654,976 |
| 2007 | 3,433,663 |
| 2006 | 3,248,757 |
| 2005 | 3,214,467 |
| 2004 | 3,610,796 |
| 2003 | 2,535,768 |
| 2002 | 2,675,205 |
| 2001 | 2,961,477 |
| 2000 | 2,923,716 |
| 1999 | 3,249,688 |
| 1998 | 3,336,548 |
| 1997 | 1,285,566 |
| 1996 | 863,639 |