| Year | Visitors |
|---|---|
| 2019 | 3,303,573 |
| 2018 | 3,288,299 |
| 2017 | 3,507,402 |
| 2016 | 4,360,502 |
| 2015 | 3,290,080 |
| 2014 | 2,938,239 |
| 2013 | 2,837,729 |
| 2012 | 2,764,459 |
| 2011 | 2,309,708 |
| 2010 | 2,238,052 |
| 2009 | 2,591,241 |
| 2008 | 2,622,806 |
| 2007 | 2,751,725 |
| 2006 | 2,662,016 |
| 2005 | 2,852,565 |
| 2004 | 3,038,046 |
| 2003 | 2,121,931 |
| 2002 | 2,493,089 |
| 2001 | 2,866,417 |
| 2000 | 2,918,846 |
| 1999 | 3,453,171 |
| 1998 | 4,258,807 |
| 1997 | 1,925,858 |