| Year | Value | | 2022 | 48,454 | | 2021 | 46,736 | | 2020 | 44,927 | | 2019 | 43,022 | | 2018 | 41,345 | | 2017 | 39,856 | | 2016 | 38,472 | | 2015 | 37,163 | | 2014 | 35,917 | | 2013 | 34,588 | | 2012 | 33,155 | | 2011 | 31,759 | | 2010 | 30,486 | | 2009 | 29,335 | | 2008 | 28,280 | | 2007 | 27,301 | | 2006 | 26,326 | | 2005 | 25,322 | | 2004 | 24,294 | | 2003 | 23,255 | | 2002 | 22,213 | | 2001 | 21,211 | | 2000 | 20,266 | | 1999 | 19,378 | | 1998 | 18,534 | | 1997 | 17,732 | | 1996 | 17,001 | | 1995 | 16,366 | | 1994 | 15,815 | | 1993 | 15,336 | | 1992 | 14,906 | | 1991 | 14,452 | | 1990 | 13,949 | | 1989 | 13,431 | | 1988 | 12,884 | | 1987 | 12,311 | | 1986 | 11,759 | | 1985 | 11,246 | | 1984 | 10,738 | | 1983 | 10,202 | | 1982 | 9,658 | | 1981 | 9,113 | | 1980 | 8,588 | | 1979 | 8,091 | | 1978 | 7,604 | | 1977 | 7,156 | | 1976 | 6,763 | | 1975 | 6,424 | | 1974 | 6,127 | | 1973 | 5,839 | | 1972 | 5,558 | | 1971 | 5,291 | | 1970 | 5,032 | | 1969 | 4,794 | | 1968 | 4,580 | | 1967 | 4,391 | | 1966 | 4,227 | | 1965 | 4,087 | | 1964 | 3,961 | | 1963 | 3,830 | | 1962 | 3,691 | | 1961 | 3,543 | | 1960 | 3,389 |
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