| Year | Value | | 2022 | 5,417 | | 2021 | 4,533 | | 2020 | 4,513 | | 2019 | 4,483 | | 2018 | 4,429 | | 2017 | 4,348 | | 2016 | 4,288 | | 2015 | 4,289 | | 2014 | 4,247 | | 2013 | 4,246 | | 2012 | 4,254 | | 2011 | 4,230 | | 2010 | 4,330 | | 2009 | 4,211 | | 2008 | 4,139 | | 2007 | 3,980 | | 2006 | 3,921 | | 2005 | 3,751 | | 2004 | 3,629 | | 2003 | 3,595 | | 2002 | 3,622 | | 2001 | 3,498 | | 2000 | 3,477 | | 1999 | 3,444 | | 1998 | 3,402 | | 1997 | 3,312 | | 1996 | 3,252 | | 1995 | 3,244 | | 1994 | 3,221 | | 1993 | 3,122 | | 1992 | 3,013 | | 1991 | 2,926 | | 1990 | 2,781 | | 1989 | 2,638 | | 1988 | 2,480 | | 1987 | 2,340 | | 1986 | 2,147 | | 1985 | 2,056 | | 1984 | 1,975 | | 1983 | 1,905 | | 1982 | 1,855 | | 1981 | 1,804 | | 1980 | 1,753 | | 1979 | 1,716 | | 1978 | 1,683 | | 1977 | 1,654 | | 1976 | 1,592 | | 1975 | 1,537 | | 1974 | 1,489 | | 1973 | 1,457 | | 1972 | 1,432 | | 1971 | 1,404 | | 1970 | 1,406 | | 1969 | 1,417 | | 1968 | 1,428 | | 1967 | 1,434 | | 1966 | 1,436 | | 1965 | 1,427 | | 1964 | 1,410 | | 1963 | 1,387 | | 1962 | 1,359 | | 1961 | 1,326 | | 1960 | 1,291 |
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