| Year | Value | | 2022 | 305,472 | | 2021 | 305,025 | | 2020 | 305,076 | | 2019 | 305,891 | | 2018 | 304,679 | | 2017 | 301,940 | | 2016 | 299,495 | | 2015 | 295,690 | | 2014 | 290,714 | | 2013 | 284,696 | | 2012 | 278,097 | | 2011 | 271,565 | | 2010 | 265,870 | | 2009 | 261,844 | | 2008 | 259,646 | | 2007 | 258,978 | | 2006 | 259,286 | | 2005 | 259,437 | | 2004 | 258,768 | | 2003 | 257,659 | | 2002 | 256,653 | | 2001 | 256,517 | | 2000 | 257,662 | | 1999 | 259,546 | | 1998 | 261,010 | | 1997 | 261,323 | | 1996 | 260,764 | | 1995 | 259,953 | | 1994 | 257,864 | | 1993 | 254,231 | | 1992 | 249,523 | | 1991 | 242,875 | | 1990 | 234,856 | | 1989 | 227,269 | | 1988 | 219,876 | | 1987 | 211,957 | | 1986 | 204,210 | | 1985 | 196,299 | | 1984 | 187,437 | | 1983 | 178,827 | | 1982 | 171,553 | | 1981 | 164,850 | | 1980 | 158,793 | | 1979 | 154,175 | | 1978 | 150,172 | | 1977 | 145,819 | | 1976 | 141,384 | | 1975 | 136,968 | | 1974 | 132,672 | | 1973 | 128,656 | | 1972 | 125,156 | | 1971 | 122,429 | | 1970 | 121,059 | | 1969 | 121,351 | | 1968 | 122,711 | | 1967 | 124,381 | | 1966 | 125,747 | | 1965 | 126,524 | | 1964 | 126,827 | | 1963 | 126,765 | | 1962 | 126,485 | | 1961 | 126,394 | | 1960 | 126,598 |
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