| Year | Visitors |
|---|---|
| 2019 | 221,301 |
| 2018 | 217,530 |
| 2017 | 214,783 |
| 2016 | 231,390 |
| 2015 | 214,441 |
| 2014 | 215,767 |
| 2013 | 198,367 |
| 2012 | 212,446 |
| 2011 | 212,458 |
| 2010 | 180,203 |
| 2009 | 212,933 |
| 2008 | 192,154 |
| 2007 | 182,504 |
| 2006 | 185,176 |
| 2005 | 175,800 |
| 2004 | 242,682 |
| 2003 | 206,337 |
| 2002 | 232,768 |
| 2001 | 193,105 |
| 2000 | 240,194 |
| 1999 | 245,899 |
| 1998 | 249,518 |
| 1997 | 298,642 |
| 1996 | 216,699 |
| 1995 | 232,228 |
| 1994 | 241,947 |
| 1993 | 226,077 |
| 1992 | 186,272 |
| 1991 | 86,414 |
| 1990 | 104,902 |
| 1989 | 21,305 |
| 1988 | 16,346 |
| 1987 | 6,722 |