| Year | Visitors |
|---|---|
| 2019 | 2,416,232 |
| 2018 | 2,395,342 |
| 2017 | 2,483,788 |
| 2016 | 2,478,735 |
| 2015 | 2,443,772 |
| 2014 | 2,437,948 |
| 2013 | 1,968,995 |
| 2012 | 2,003,385 |
| 2011 | 2,050,490 |
| 2010 | 1,883,457 |
| 2009 | 2,076,500 |
| 2008 | 2,076,466 |
| 2007 | 2,061,366 |
| 2006 | 2,181,863 |
| 2005 | 2,132,088 |
| 2004 | 2,115,516 |
| 2003 | 2,036,731 |
| 2002 | 2,075,687 |
| 2001 | 2,185,813 |
| 2000 | 2,039,559 |
| 1999 | 1,998,719 |
| 1998 | 2,015,825 |
| 1997 | 2,001,085 |
| 1996 | 1,873,822 |
| 1995 | 2,049,141 |
| 1994 | 2,332,045 |
| 1993 | 2,146,546 |
| 1992 | 1,971,419 |
| 1991 | 2,155,770 |
| 1990 | 2,204,125 |
| 1989 | 2,049,651 |
| 1988 | 1,564,453 |
| 1987 | 1,724,665 |
| 1986 | 2,188,249 |
| 1985 | 1,891,539 |
| 1984 | 1,492,638 |
| 1983 | 2,360,791 |
| 1982 | 1,764,535 |
| 1981 | 917,310 |
| 1980 | 1,059,794 |
| 1979 | 1,156,593 |