| Year | Visitors |
|---|---|
| 2019 | 329,729 |
| 2018 | 146,364 |
| 2017 | 154,011 |
| 2016 | 123,381 |
| 2015 | 148,729 |
| 2014 | 109,473 |
| 2013 | 161,999 |
| 2012 | 124,107 |
| 2011 | 279,060 |
| 2010 | 248,314 |
| 2009 | 234,186 |
| 2008 | 324,394 |
| 2007 | 184,636 |
| 2006 | 199,443 |
| 2005 | 176,174 |
| 2004 | 190,745 |
| 2003 | 184,823 |
| 2002 | 229,607 |
| 2001 | 251,261 |
| 2000 | 201,177 |
| 1999 | 239,008 |
| 1998 | 233,571 |
| 1997 | 245,228 |
| 1996 | 194,494 |
| 1995 | 147,541 |
| 1994 | 133,758 |
| 1993 | 139,165 |
| 1992 | 213,494 |
| 1991 | 164,463 |
| 1990 | 270,008 |
| 1989 | 181,106 |
| 1988 | 56,157 |
| 1987 | 87,658 |
| 1986 | 76,425 |
| 1985 | 58,608 |
| 1984 | 58,078 |
| 1983 | 69,712 |
| 1982 | 118,545 |
| 1981 | 116,678 |
| 1980 | 160,912 |
| 1979 | 137,971 |