| Year | Value | | 2022 | 14,290 | | 2021 | 13,946 | | 2020 | 13,697 | | 2019 | 13,537 | | 2018 | 13,495 | | 2017 | 13,593 | | 2016 | 13,830 | | 2015 | 14,161 | | 2014 | 14,359 | | 2013 | 14,433 | | 2012 | 14,572 | | 2011 | 14,764 | | 2010 | 14,707 | | 2009 | 13,989 | | 2008 | 12,900 | | 2007 | 11,955 | | 2006 | 11,312 | | 2005 | 10,955 | | 2004 | 10,742 | | 2003 | 10,400 | | 2002 | 9,781 | | 2001 | 9,023 | | 2000 | 8,332 | | 1999 | 7,855 | | 1998 | 7,579 | | 1997 | 7,417 | | 1996 | 7,287 | | 1995 | 7,130 | | 1994 | 6,921 | | 1993 | 6,662 | | 1992 | 6,377 | | 1991 | 6,090 | | 1990 | 5,891 | | 1989 | 5,800 | | 1988 | 5,783 | | 1987 | 5,815 | | 1986 | 5,867 | | 1985 | 5,944 | | 1984 | 6,049 | | 1983 | 6,184 | | 1982 | 6,335 | | 1981 | 6,474 | | 1980 | 6,440 | | 1979 | 6,231 | | 1978 | 6,000 | | 1977 | 5,753 | | 1976 | 5,532 | | 1975 | 5,392 | | 1974 | 5,293 | | 1973 | 5,191 | | 1972 | 5,106 | | 1971 | 5,032 | | 1970 | 4,951 | | 1969 | 4,869 | | 1968 | 4,785 | | 1967 | 4,694 | | 1966 | 4,588 | | 1965 | 4,464 | | 1964 | 4,324 | | 1963 | 4,167 | | 1962 | 3,995 | | 1961 | 3,814 | | 1960 | 3,630 |
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