| Year | Value | | 2022 | 13,879 | | 2021 | 13,632 | | 2020 | 13,425 | | 2019 | 13,227 | | 2018 | 13,012 | | 2017 | 12,749 | | 2016 | 12,426 | | 2015 | 12,042 | | 2014 | 11,595 | | 2013 | 11,080 | | 2012 | 10,515 | | 2011 | 9,944 | | 2010 | 9,420 | | 2009 | 9,000 | | 2008 | 8,737 | | 2007 | 8,638 | | 2006 | 8,636 | | 2005 | 8,637 | | 2004 | 8,534 | | 2003 | 8,248 | | 2002 | 7,701 | | 2001 | 7,046 | | 2000 | 6,568 | | 1999 | 6,403 | | 1998 | 6,430 | | 1997 | 6,424 | | 1996 | 6,375 | | 1995 | 6,300 | | 1994 | 6,206 | | 1993 | 6,098 | | 1992 | 5,976 | | 1991 | 5,834 | | 1990 | 5,673 | | 1989 | 5,499 | | 1988 | 5,323 | | 1987 | 5,154 | | 1986 | 4,994 | | 1985 | 4,847 | | 1984 | 4,715 | | 1983 | 4,600 | | 1982 | 4,500 | | 1981 | 4,410 | | 1980 | 4,335 | | 1979 | 4,283 | | 1978 | 4,245 | | 1977 | 4,219 | | 1976 | 4,203 | | 1975 | 4,191 | | 1974 | 4,181 | | 1973 | 4,172 | | 1972 | 4,161 | | 1971 | 4,146 | | 1970 | 4,127 | | 1969 | 4,104 | | 1968 | 4,075 | | 1967 | 4,035 | | 1966 | 3,995 | | 1965 | 3,957 | | 1964 | 3,914 | | 1963 | 3,863 | | 1962 | 3,803 | | 1961 | 3,738 | | 1960 | 3,662 |
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