| Year | Value | | 2022 | 10,682 | | 2021 | 10,241 | | 2020 | 9,906 | | 2019 | 9,762 | | 2018 | 9,782 | | 2017 | 9,851 | | 2016 | 9,914 | | 2015 | 9,995 | | 2014 | 10,068 | | 2013 | 10,091 | | 2012 | 10,111 | | 2011 | 10,145 | | 2010 | 10,141 | | 2009 | 10,114 | | 2008 | 10,086 | | 2007 | 10,031 | | 2006 | 9,897 | | 2005 | 9,669 | | 2004 | 9,382 | | 2003 | 9,048 | | 2002 | 8,681 | | 2001 | 8,290 | | 2000 | 7,888 | | 1999 | 7,484 | | 1998 | 7,082 | | 1997 | 6,685 | | 1996 | 6,314 | | 1995 | 5,978 | | 1994 | 5,681 | | 1993 | 5,440 | | 1992 | 5,242 | | 1991 | 5,080 | | 1990 | 4,965 | | 1989 | 4,871 | | 1988 | 4,766 | | 1987 | 4,659 | | 1986 | 4,560 | | 1985 | 4,452 | | 1984 | 4,341 | | 1983 | 4,225 | | 1982 | 4,095 | | 1981 | 3,954 | | 1980 | 3,807 | | 1979 | 3,649 | | 1978 | 3,482 | | 1977 | 3,328 | | 1976 | 3,182 | | 1975 | 3,027 | | 1974 | 2,878 | | 1973 | 2,743 | | 1972 | 2,631 | | 1971 | 2,544 | | 1970 | 2,479 | | 1969 | 2,433 | | 1968 | 2,386 | | 1967 | 2,322 | | 1966 | 2,225 | | 1965 | 2,094 | | 1964 | 1,950 | | 1963 | 1,817 | | 1962 | 1,716 | | 1961 | 1,672 | | 1960 | 1,686 |
|