Year | Value | 2022 | 22,828 | 2021 | 22,983 | 2020 | 23,363 | 2019 | 23,386 | 2018 | 22,964 | 2017 | 22,478 | 2016 | 22,173 | 2015 | 22,028 | 2014 | 21,953 | 2013 | 21,939 | 2012 | 21,890 | 2011 | 21,589 | 2010 | 21,006 | 2009 | 20,307 | 2008 | 19,599 | 2007 | 18,989 | 2006 | 18,507 | 2005 | 18,072 | 2004 | 17,607 | 2003 | 17,121 | 2002 | 16,627 | 2001 | 16,259 | 2000 | 15,661 | 1999 | 15,045 | 1998 | 14,373 | 1997 | 13,636 | 1996 | 12,957 | 1995 | 12,315 | 1994 | 11,890 | 1993 | 11,797 | 1992 | 12,136 | 1991 | 12,856 | 1990 | 13,780 | 1989 | 14,676 | 1988 | 15,261 | 1987 | 15,347 | 1986 | 14,883 | 1985 | 13,987 | 1984 | 12,804 | 1983 | 11,490 | 1982 | 10,216 | 1981 | 9,099 | 1980 | 8,207 | 1979 | 7,550 | 1978 | 7,126 | 1977 | 6,913 | 1976 | 6,913 | 1975 | 7,023 | 1974 | 7,097 | 1973 | 7,105 | 1972 | 7,038 | 1971 | 6,833 | 1970 | 6,591 | 1969 | 6,489 | 1968 | 6,557 | 1967 | 6,824 | 1966 | 7,241 | 1965 | 7,652 | 1964 | 7,959 | 1963 | 8,128 | 1962 | 8,063 | 1961 | 7,754 | 1960 | 7,438 |
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