| Year | Visitors |
|---|---|
| 2019 | 232,921 |
| 2018 | 218,015 |
| 2017 | 196,857 |
| 2016 | 185,041 |
| 2015 | 170,683 |
| 2014 | 154,206 |
| 2013 | 158,124 |
| 2012 | 153,584 |
| 2011 | 162,906 |
| 2010 | 132,731 |
| 2009 | 166,380 |
| 2008 | 104,835 |
| 2007 | 119,237 |
| 2006 | 112,344 |
| 2005 | 85,891 |
| 2004 | 91,462 |
| 2003 | 77,632 |
| 2002 | 70,101 |
| 2001 | 54,000 |
| 2000 | 44,150 |
| 1999 | 47,328 |
| 1998 | 56,584 |
| 1997 | 44,258 |
| 1996 | 48,836 |
| 1995 | 49,634 |
| 1994 | 46,370 |
| 1993 | 44,481 |
| 1992 | 42,591 |
| 1991 | 46,780 |
| 1990 | 23,580 |
| 1989 | 17,354 |
| 1988 | 12,462 |