| Year | Value | | 2022 | 576,068 | | 2021 | 547,345 | | 2020 | 520,894 | | 2019 | 495,117 | | 2018 | 470,541 | | 2017 | 447,967 | | 2016 | 426,096 | | 2015 | 405,218 | | 2014 | 378,801 | | 2013 | 346,486 | | 2012 | 314,646 | | 2011 | 283,783 | | 2010 | 251,741 | | 2009 | 230,604 | | 2008 | 223,470 | | 2007 | 220,381 | | 2006 | 221,358 | | 2005 | 225,003 | | 2004 | 230,558 | | 2003 | 237,806 | | 2002 | 245,652 | | 2001 | 251,862 | | 2000 | 255,371 | | 1999 | 255,971 | | 1998 | 253,891 | | 1997 | 248,654 | | 1996 | 245,104 | | 1995 | 245,544 | | 1994 | 249,416 | | 1993 | 256,439 | | 1992 | 263,868 | | 1991 | 266,188 | | 1990 | 260,323 | | 1989 | 246,725 | | 1988 | 224,483 | | 1987 | 196,601 | | 1986 | 169,611 | | 1985 | 147,644 | | 1984 | 129,922 | | 1983 | 115,609 | | 1982 | 105,514 | | 1981 | 98,435 | | 1980 | 93,726 | | 1979 | 92,205 | | 1978 | 94,341 | | 1977 | 98,673 | | 1976 | 103,181 | | 1975 | 106,575 | | 1974 | 108,830 | | 1973 | 109,964 | | 1972 | 110,211 | | 1971 | 110,939 | | 1970 | 112,925 | | 1969 | 115,672 | | 1968 | 118,820 | | 1967 | 122,446 | | 1966 | 125,976 | | 1965 | 128,946 | | 1964 | 131,544 | | 1963 | 134,019 | | 1962 | 135,888 | | 1961 | 136,328 | | 1960 | 134,914 |
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