| Year | Value | | 2022 | 5,670 | | 2021 | 5,335 | | 2020 | 5,028 | | 2019 | 4,727 | | 2018 | 4,438 | | 2017 | 4,194 | | 2016 | 4,085 | | 2015 | 4,047 | | 2014 | 4,016 | | 2013 | 4,038 | | 2012 | 4,078 | | 2011 | 4,100 | | 2010 | 4,151 | | 2009 | 4,198 | | 2008 | 4,217 | | 2007 | 4,221 | | 2006 | 4,201 | | 2005 | 4,088 | | 2004 | 3,938 | | 2003 | 3,879 | | 2002 | 3,829 | | 2001 | 3,741 | | 2000 | 3,683 | | 1999 | 3,623 | | 1998 | 3,508 | | 1997 | 3,387 | | 1996 | 3,267 | | 1995 | 3,170 | | 1994 | 3,127 | | 1993 | 3,101 | | 1992 | 3,041 | | 1991 | 2,981 | | 1990 | 2,924 | | 1989 | 2,850 | | 1988 | 2,798 | | 1987 | 2,753 | | 1986 | 2,674 | | 1985 | 2,621 | | 1984 | 2,618 | | 1983 | 2,586 | | 1982 | 2,530 | | 1981 | 2,484 | | 1980 | 2,459 | | 1979 | 2,417 | | 1978 | 2,347 | | 1977 | 2,306 | | 1976 | 2,289 | | 1975 | 2,263 | | 1974 | 2,216 | | 1973 | 2,181 | | 1972 | 2,168 | | 1971 | 2,165 | | 1970 | 2,104 | | 1969 | 2,024 | | 1968 | 1,948 | | 1967 | 1,827 | | 1966 | 1,698 | | 1965 | 1,624 | | 1964 | 1,596 | | 1963 | 1,544 | | 1962 | 1,500 | | 1961 | 1,446 | | 1960 | 1,359 |
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