Visitation Statistics by Year |
| 2010 | 4,388,386 |
| 2009 | 4,348,068 |
| 2008 | 4,425,314 |
| 2007 | 4,413,668 |
| 2006 | 4,279,439 |
| 2005 | 4,401,522 |
| 2004 | 4,326,234 |
| 2003 | 4,124,900 |
| 2002 | 4,001,974 |
| 2001 | 4,104,809 |
| 2000 | 4,460,228 |
| 1999 | 4,575,124 |
| 1998 | 4,239,682 |
| 1997 | 4,510,251 |
| 1996 | 4,537,703 |
| 1995 | 4,557,645 |
| 1994 | 4,364,316 |
| 1993 | 4,575,602 |
| 1992 | 4,203,545 |
| 1991 | 3,886,031 |
| 1990 | 3,776,685 |
| 1989 | 3,966,209 |
| 1988 | 3,859,886 |
| 1987 | 3,513,030 |
| 1986 | 3,035,787 |
| 1985 | 2,711,529 |
| 1984 | 2,173,584 |
| 1983 | 2,248,082 |
| 1982 | 2,293,127 |
| 1981 | 2,472,270 |
| 1980 | 2,304,973 |
| 1979 | 2,131,716 |
| 1978 | 2,748,642 |
| 1977 | 2,627,200 |
| 1976 | 2,791,600 |
| 1975 | 2,625,100 |
| 1974 | 1,888,600 |
| 1973 | 1,909,700 |
| 1972 | 2,698,300 |
| 1971 | 2,402,100 |
| 1970 | 2,258,200 |
| 1969 | 2,192,600 |
| 1968 | 1,986,300 |
| 1967 | 1,804,900 |
| 1966 | 1,806,000 |
| 1965 | 1,689,200 |
| 1964 | 1,576,600 |
| 1963 | 1,539,500 |
| 1962 | 1,447,400 |
| 1961 | 1,253,000 |
| 1960 | 1,187,700 |
| 1959 | 1,169,400 |
| 1958 | 1,064,000 |
| 1957 | 1,102,400 |
| 1956 | 1,033,700 |
| 1955 | 892,400 |
| 1954 | 814,700 |
| 1953 | 836,878 |
| 1952 | 737,159 |
| 1951 | 682,152 |
| 1950 | 665,039 |
| 1949 | 600,690 |
| 1948 | 618,033 |
| 1947 | 622,363 |
| 1946 | 486,834 |
| 1945 | 169,960 |
| 1944 | 64,568 |
| 1943 | 71,650 |
| 1942 | 132,584 |
| 1941 | 436,566 |
| 1940 | 371,613 |
| 1939 | 395,940 |
| 1938 | 336,557 |
| 1937 | 297,876 |
| 1936 | 268,412 |
| 1935 | 206,018 |
| 1934 | 140,220 |
| 1933 | 105,475 |
| 1932 | 121,267 |
| 1931 | 156,964 |
| 1930 | 172,763 |
| 1929 | 184,093 |
| 1928 | 167,226 |
| 1927 | 162,356 |
| 1926 | 140,252 |
| 1925 | 134,053 |
| 1924 | 108,256 |
| 1923 | 102,166 |
| 1922 | 84,700 |
| 1921 | 67,485 |
| 1920 | 67,315 |
| 1919 | 37,745 |
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