Year | Value | 2022 | 18,854 | 2021 | 19,196 | 2020 | 19,552 | 2019 | 19,852 | 2018 | 19,868 | 2017 | 19,682 | 2016 | 19,474 | 2015 | 19,216 | 2014 | 19,002 | 2013 | 18,909 | 2012 | 18,910 | 2011 | 19,004 | 2010 | 19,193 | 2009 | 19,324 | 2008 | 19,302 | 2007 | 19,223 | 2006 | 19,126 | 2005 | 18,998 | 2004 | 18,821 | 2003 | 18,578 | 2002 | 18,261 | 2001 | 17,855 | 2000 | 17,438 | 1999 | 17,044 | 1998 | 16,684 | 1997 | 16,404 | 1996 | 16,223 | 1995 | 16,086 | 1994 | 15,931 | 1993 | 15,751 | 1992 | 15,525 | 1991 | 15,284 | 1990 | 15,090 | 1989 | 14,950 | 1988 | 14,805 | 1987 | 14,648 | 1986 | 14,489 | 1985 | 14,341 | 1984 | 14,198 | 1983 | 14,054 | 1982 | 13,894 | 1981 | 13,690 | 1980 | 13,377 | 1979 | 12,996 | 1978 | 12,628 | 1977 | 12,265 | 1976 | 11,906 | 1975 | 11,560 | 1974 | 11,263 | 1973 | 11,099 | 1972 | 11,061 | 1971 | 11,096 | 1970 | 11,198 | 1969 | 11,272 | 1968 | 11,196 | 1967 | 10,988 | 1966 | 10,708 | 1965 | 10,372 | 1964 | 9,993 | 1963 | 9,595 | 1962 | 9,232 | 1961 | 8,923 | 1960 | 8,653 |
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