| Year | Value | | 2022 | 16,537 | | 2021 | 15,963 | | 2020 | 15,470 | | 2019 | 15,004 | | 2018 | 14,546 | | 2017 | 14,090 | | 2016 | 13,632 | | 2015 | 13,142 | | 2014 | 12,621 | | 2013 | 12,103 | | 2012 | 11,611 | | 2011 | 11,162 | | 2010 | 10,706 | | 2009 | 10,258 | | 2008 | 9,878 | | 2007 | 9,554 | | 2006 | 9,275 | | 2005 | 9,032 | | 2004 | 8,811 | | 2003 | 8,608 | | 2002 | 8,416 | | 2001 | 8,218 | | 2000 | 8,009 | | 1999 | 7,804 | | 1998 | 7,614 | | 1997 | 7,450 | | 1996 | 7,324 | | 1995 | 7,235 | | 1994 | 7,172 | | 1993 | 7,114 | | 1992 | 7,022 | | 1991 | 6,898 | | 1990 | 6,790 | | 1989 | 6,715 | | 1988 | 6,666 | | 1987 | 6,618 | | 1986 | 6,545 | | 1985 | 6,429 | | 1984 | 6,260 | | 1983 | 6,040 | | 1982 | 5,810 | | 1981 | 5,650 | | 1980 | 5,605 | | 1979 | 5,638 | | 1978 | 5,682 | | 1977 | 5,656 | | 1976 | 5,493 | | 1975 | 5,208 | | 1974 | 4,936 | | 1973 | 4,670 | | 1972 | 4,328 | | 1971 | 4,017 | | 1970 | 3,819 | | 1969 | 3,737 | | 1968 | 3,752 | | 1967 | 3,818 | | 1966 | 3,871 | | 1965 | 3,841 | | 1964 | 3,684 | | 1963 | 3,407 | | 1962 | 3,058 | | 1961 | 2,741 | | 1960 | 2,614 |
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