| Year | Visitors |
|---|---|
| 2019 | 50,789 |
| 2018 | 51,680 |
| 2017 | 60,735 |
| 2016 | 66,441 |
| 2015 | 67,797 |
| 2014 | 62,057 |
| 2013 | 67,455 |
| 2012 | 69,940 |
| 2011 | 66,157 |
| 2010 | 64,849 |
| 2009 | 69,972 |
| 2008 | 82,417 |
| 2007 | 84,501 |
| 2006 | 86,016 |
| 2005 | 94,945 |
| 2004 | 71,294 |
| 2003 | 62,784 |
| 2002 | 52,706 |
| 2001 | 59,716 |
| 2000 | 52,103 |
| 1999 | 49,097 |
| 1998 | 49,629 |
| 1997 | 44,548 |
| 1996 | 39,766 |
| 1995 | 32,261 |
| 1994 | 28,405 |
| 1993 | 28,737 |
| 1992 | 35,132 |
| 1991 | 34,279 |
| 1990 | 34,822 |
| 1989 | 34,520 |
| 1988 | 22,857 |