| Year | Visitors |
|---|---|
| 2019 | 1,007,471 |
| 2018 | 794,350 |
| 2017 | 922,883 |
| 2016 | 1,102,148 |
| 2015 | 1,112,290 |
| 2014 | 1,192,856 |
| 2013 | 1,007,788 |
| 2012 | 882,570 |
| 2011 | 941,393 |
| 2010 | 665,523 |
| 2009 | 812,207 |
| 2008 | 813,790 |
| 2007 | 822,864 |
| 2006 | 825,857 |
| 2005 | 768,687 |
| 2004 | 385,194 |
| 2003 | 400,902 |
| 2002 | 449,481 |
| 2001 | 409,771 |
| 2000 | 505,062 |
| 1999 | 503,110 |
| 1998 | 474,895 |
| 1997 | 462,553 |
| 1996 | 424,920 |
| 1995 | 365,463 |
| 1994 | 294,307 |
| 1993 | 234,830 |
| 1992 | 212,682 |
| 1991 | 159,172 |
| 1990 | 127,790 |
| 1989 | 81,157 |