| 年度 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| 游客人数 | 6.9 | 6.8 | 5.7 | 3.5 | 4.7 | 4.7 | 4.1 | 3.0 | 4.5 | 4.5 | 5.7 |