| Year | Value | | 2022 | 13,792 | | 2021 | 14,025 | | 2020 | 14,220 | | 2019 | 14,167 | | 2018 | 13,886 | | 2017 | 13,586 | | 2016 | 13,343 | | 2015 | 13,148 | | 2014 | 13,082 | | 2013 | 13,165 | | 2012 | 13,182 | | 2011 | 13,005 | | 2010 | 12,744 | | 2009 | 12,390 | | 2008 | 11,881 | | 2007 | 11,289 | | 2006 | 10,767 | | 2005 | 10,294 | | 2004 | 9,852 | | 2003 | 9,468 | | 2002 | 9,056 | | 2001 | 8,550 | | 2000 | 8,019 | | 1999 | 7,577 | | 1998 | 7,219 | | 1997 | 6,936 | | 1996 | 6,714 | | 1995 | 6,439 | | 1994 | 6,160 | | 1993 | 5,962 | | 1992 | 5,800 | | 1991 | 5,681 | | 1990 | 5,656 | | 1989 | 5,672 | | 1988 | 5,653 | | 1987 | 5,599 | | 1986 | 5,533 | | 1985 | 5,468 | | 1984 | 5,390 | | 1983 | 5,298 | | 1982 | 5,204 | | 1981 | 5,115 | | 1980 | 4,976 | | 1979 | 4,786 | | 1978 | 4,597 | | 1977 | 4,399 | | 1976 | 4,196 | | 1975 | 3,998 | | 1974 | 3,820 | | 1973 | 3,659 | | 1972 | 3,515 | | 1971 | 3,391 | | 1970 | 3,290 | | 1969 | 3,204 | | 1968 | 3,128 | | 1967 | 3,073 | | 1966 | 3,042 | | 1965 | 3,030 | | 1964 | 3,031 | | 1963 | 2,986 | | 1962 | 2,870 | | 1961 | 2,726 | | 1960 | 2,568 |
|