| Year | Value | | 2022 | 9,467 | | 2021 | 9,490 | | 2020 | 9,524 | | 2019 | 9,634 | | 2018 | 9,816 | | 2017 | 10,010 | | 2016 | 10,187 | | 2015 | 10,313 | | 2014 | 10,307 | | 2013 | 10,071 | | 2012 | 9,773 | | 2011 | 9,474 | | 2010 | 9,192 | | 2009 | 8,963 | | 2008 | 8,788 | | 2007 | 8,608 | | 2006 | 8,394 | | 2005 | 8,138 | | 2004 | 7,835 | | 2003 | 7,507 | | 2002 | 7,169 | | 2001 | 6,828 | | 2000 | 6,512 | | 1999 | 6,223 | | 1998 | 5,965 | | 1997 | 5,743 | | 1996 | 5,545 | | 1995 | 5,369 | | 1994 | 5,206 | | 1993 | 5,043 | | 1992 | 4,897 | | 1991 | 4,752 | | 1990 | 4,591 | | 1989 | 4,481 | | 1988 | 4,415 | | 1987 | 4,316 | | 1986 | 4,213 | | 1985 | 4,126 | | 1984 | 4,030 | | 1983 | 3,921 | | 1982 | 3,811 | | 1981 | 3,689 | | 1980 | 3,570 | | 1979 | 3,478 | | 1978 | 3,403 | | 1977 | 3,320 | | 1976 | 3,223 | | 1975 | 3,146 | | 1974 | 3,085 | | 1973 | 3,011 | | 1972 | 2,932 | | 1971 | 2,803 | | 1970 | 2,622 | | 1969 | 2,450 | | 1968 | 2,360 | | 1967 | 2,293 | | 1966 | 2,223 | | 1965 | 2,156 | | 1964 | 2,104 | | 1963 | 2,053 | | 1962 | 2,008 | | 1961 | 1,971 | | 1960 | 1,937 |
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