| Year | Value | | 2022 | 13,658 | | 2021 | 13,484 | | 2020 | 13,346 | | 2019 | 13,160 | | 2018 | 12,950 | | 2017 | 12,795 | | 2016 | 12,696 | | 2015 | 12,666 | | 2014 | 12,725 | | 2013 | 12,890 | | 2012 | 12,863 | | 2011 | 12,495 | | 2010 | 11,930 | | 2009 | 11,178 | | 2008 | 10,270 | | 2007 | 9,633 | | 2006 | 9,345 | | 2005 | 9,068 | | 2004 | 8,798 | | 2003 | 8,532 | | 2002 | 8,274 | | 2001 | 8,027 | | 2000 | 7,778 | | 1999 | 7,533 | | 1998 | 7,302 | | 1997 | 7,083 | | 1996 | 6,889 | | 1995 | 6,713 | | 1994 | 6,515 | | 1993 | 6,299 | | 1992 | 6,061 | | 1991 | 5,831 | | 1990 | 5,632 | | 1989 | 5,447 | | 1988 | 5,264 | | 1987 | 5,072 | | 1986 | 4,886 | | 1985 | 4,701 | | 1984 | 4,518 | | 1983 | 4,339 | | 1982 | 4,160 | | 1981 | 3,987 | | 1980 | 3,826 | | 1979 | 3,674 | | 1978 | 3,530 | | 1977 | 3,395 | | 1976 | 3,261 | | 1975 | 3,119 | | 1974 | 2,972 | | 1973 | 2,821 | | 1972 | 2,670 | | 1971 | 2,521 | | 1970 | 2,376 | | 1969 | 2,236 | | 1968 | 2,103 | | 1967 | 1,975 | | 1966 | 1,852 | | 1965 | 1,733 | | 1964 | 1,619 | | 1963 | 1,510 | | 1962 | 1,405 | | 1961 | 1,304 | | 1960 | 1,205 |
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