| Year | Value | | 2022 | 250,953 | | 2021 | 261,195 | | 2020 | 264,221 | | 2019 | 266,397 | | 2018 | 264,686 | | 2017 | 259,094 | | 2016 | 253,696 | | 2015 | 246,744 | | 2014 | 234,993 | | 2013 | 224,638 | | 2012 | 218,890 | | 2011 | 217,258 | | 2010 | 219,594 | | 2009 | 224,032 | | 2008 | 230,219 | | 2007 | 236,447 | | 2006 | 241,622 | | 2005 | 245,862 | | 2004 | 249,019 | | 2003 | 251,044 | | 2002 | 252,133 | | 2001 | 251,646 | | 2000 | 249,710 | | 1999 | 246,705 | | 1998 | 243,034 | | 1997 | 239,565 | | 1996 | 236,323 | | 1995 | 232,822 | | 1994 | 232,023 | | 1993 | 225,900 | | 1992 | 218,099 | | 1991 | 207,075 | | 1990 | 194,553 | | 1989 | 180,140 | | 1988 | 161,907 | | 1987 | 140,886 | | 1986 | 120,328 | | 1985 | 105,102 | | 1984 | 99,049 | | 1983 | 102,659 | | 1982 | 114,073 | | 1981 | 129,199 | | 1980 | 143,625 | | 1979 | 155,024 | | 1978 | 162,025 | | 1977 | 165,189 | | 1976 | 165,931 | | 1975 | 165,660 | | 1974 | 165,839 | | 1973 | 166,105 | | 1972 | 166,459 | | 1971 | 166,349 | | 1970 | 164,475 | | 1969 | 160,518 | | 1968 | 153,723 | | 1967 | 143,415 | | 1966 | 129,980 | | 1965 | 114,972 | | 1964 | 100,102 | | 1963 | 86,164 | | 1962 | 74,690 | | 1961 | 65,117 | | 1960 | 60,447 |
|