| Year | Value | | 2022 | 4,418 | | 2021 | 4,259 | | 2020 | 4,107 | | 2019 | 3,963 | | 2018 | 3,825 | | 2017 | 3,702 | | 2016 | 3,600 | | 2015 | 3,526 | | 2014 | 3,487 | | 2013 | 3,464 | | 2012 | 3,427 | | 2011 | 3,363 | | 2010 | 3,249 | | 2009 | 3,081 | | 2008 | 2,875 | | 2007 | 2,655 | | 2006 | 2,460 | | 2005 | 2,325 | | 2004 | 2,253 | | 2003 | 2,231 | | 2002 | 2,239 | | 2001 | 2,240 | | 2000 | 2,213 | | 1999 | 2,147 | | 1998 | 2,057 | | 1997 | 1,979 | | 1996 | 1,922 | | 1995 | 1,884 | | 1994 | 1,864 | | 1993 | 1,862 | | 1992 | 1,880 | | 1991 | 1,912 | | 1990 | 1,939 | | 1989 | 1,945 | | 1988 | 1,898 | | 1987 | 1,787 | | 1986 | 1,641 | | 1985 | 1,497 | | 1984 | 1,369 | | 1983 | 1,272 | | 1982 | 1,191 | | 1981 | 1,112 | | 1980 | 1,038 | | 1979 | 969 | | 1978 | 925 | | 1977 | 905 | | 1976 | 890 | | 1975 | 869 | | 1974 | 836 | | 1973 | 789 | | 1972 | 731 | | 1971 | 668 | | 1970 | 612 | | 1969 | 589 | | 1968 | 592 | | 1967 | 600 | | 1966 | 607 | | 1965 | 609 | | 1964 | 601 | | 1963 | 583 | | 1962 | 557 | | 1961 | 524 | | 1960 | 492 |
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