Year | Value | 2022 | 31,305 | 2021 | 31,122 | 2020 | 30,910 | 2019 | 30,610 | 2018 | 30,335 | 2017 | 30,060 | 2016 | 29,739 | 2015 | 29,366 | 2014 | 28,971 | 2013 | 28,657 | 2012 | 28,421 | 2011 | 27,962 | 2010 | 27,556 | 2009 | 27,044 | 2008 | 26,115 | 2007 | 25,191 | 2006 | 24,323 | 2005 | 23,497 | 2004 | 22,715 | 2003 | 21,982 | 2002 | 21,288 | 2001 | 20,657 | 2000 | 20,104 | 1999 | 19,586 | 1998 | 19,079 | 1997 | 18,591 | 1996 | 18,120 | 1995 | 17,674 | 1994 | 17,255 | 1993 | 16,855 | 1992 | 16,476 | 1991 | 16,090 | 1990 | 15,617 | 1989 | 15,091 | 1988 | 14,593 | 1987 | 14,117 | 1986 | 13,656 | 1985 | 13,202 | 1984 | 12,753 | 1983 | 12,315 | 1982 | 11,889 | 1981 | 11,472 | 1980 | 11,109 | 1979 | 10,876 | 1978 | 10,727 | 1977 | 10,578 | 1976 | 10,428 | 1975 | 10,282 | 1974 | 10,146 | 1973 | 10,018 | 1972 | 9,907 | 1971 | 9,813 | 1970 | 9,581 | 1969 | 9,117 | 1968 | 8,649 | 1967 | 8,337 | 1966 | 8,139 | 1965 | 8,018 | 1964 | 7,949 | 1963 | 7,919 | 1962 | 7,902 | 1961 | 7,885 | 1960 | 7,850 |
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