| Year | Visitors |
|---|---|
| 2019 | 750,494 |
| 2018 | 760,906 |
| 2017 | 761,200 |
| 2016 | 684,715 |
| 2015 | 643,135 |
| 2014 | 599,906 |
| 2013 | 565,063 |
| 2012 | 600,161 |
| 2011 | 606,579 |
| 2010 | 656,374 |
| 2009 | 686,747 |
| 2008 | 675,928 |
| 2007 | 626,751 |
| 2006 | 622,807 |
| 2005 | 699,230 |
| 2004 | 696,114 |
| 2003 | 752,140 |
| 2002 | 852,873 |
| 2001 | 916,548 |
| 2000 | 864,200 |
| 1999 | 860,224 |
| 1998 | 856,480 |
| 1997 | 858,388 |
| 1996 | 855,882 |
| 1995 | 892,328 |
| 1994 | 800,460 |
| 1993 | 737,947 |
| 1992 | 752,203 |
| 1991 | 860,017 |
| 1990 | 794,539 |
| 1989 | 730,183 |
| 1988 | 613,011 |