Year | Value | 2022 | 30,150 | 2021 | 29,933 | 2020 | 31,339 | 2019 | 33,321 | 2018 | 35,628 | 2017 | 37,517 | 2016 | 37,752 | 2015 | 37,146 | 2014 | 36,223 | 2013 | 34,838 | 2012 | 33,629 | 2011 | 32,978 | 2010 | 32,962 | 2009 | 33,391 | 2008 | 34,168 | 2007 | 34,395 | 2006 | 34,044 | 2005 | 33,637 | 2004 | 33,115 | 2003 | 32,508 | 2002 | 31,853 | 2001 | 30,974 | 2000 | 29,456 | 1999 | 27,072 | 1998 | 24,786 | 1997 | 22,725 | 1996 | 20,684 | 1995 | 19,912 | 1994 | 20,644 | 1993 | 21,828 | 1992 | 23,649 | 1991 | 26,074 | 1990 | 28,012 | 1989 | 28,884 | 1988 | 29,000 | 1987 | 28,860 | 1986 | 28,526 | 1985 | 28,098 | 1984 | 27,741 | 1983 | 27,533 | 1982 | 27,259 | 1981 | 26,895 | 1980 | 26,768 | 1979 | 26,615 | 1978 | 26,221 | 1977 | 25,647 | 1976 | 24,993 | 1975 | 24,301 | 1974 | 23,473 | 1973 | 22,770 | 1972 | 22,284 | 1971 | 21,890 | 1970 | 21,357 | 1969 | 21,047 | 1968 | 20,923 | 1967 | 20,539 | 1966 | 20,141 | 1965 | 19,858 | 1964 | 19,436 | 1963 | 18,824 | 1962 | 18,448 | 1961 | 18,050 | 1960 | 17,438 |
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