| Year | Value | | 2022 | 5,233 | | 2021 | 5,167 | | 2020 | 5,127 | | 2019 | 5,099 | | 2018 | 5,088 | | 2017 | 5,029 | | 2016 | 4,935 | | 2015 | 4,851 | | 2014 | 4,799 | | 2013 | 4,785 | | 2012 | 4,757 | | 2011 | 4,739 | | 2010 | 4,735 | | 2009 | 4,682 | | 2008 | 4,608 | | 2007 | 4,530 | | 2006 | 4,454 | | 2005 | 4,421 | | 2004 | 4,419 | | 2003 | 4,419 | | 2002 | 4,422 | | 2001 | 4,446 | | 2000 | 4,474 | | 1999 | 4,466 | | 1998 | 4,421 | | 1997 | 4,354 | | 1996 | 4,274 | | 1995 | 4,199 | | 1994 | 4,123 | | 1993 | 4,043 | | 1992 | 3,984 | | 1991 | 3,940 | | 1990 | 3,877 | | 1989 | 3,768 | | 1988 | 3,645 | | 1987 | 3,534 | | 1986 | 3,419 | | 1985 | 3,306 | | 1984 | 3,168 | | 1983 | 2,987 | | 1982 | 2,801 | | 1981 | 2,630 | | 1980 | 2,474 | | 1979 | 2,349 | | 1978 | 2,270 | | 1977 | 2,218 | | 1976 | 2,172 | | 1975 | 2,129 | | 1974 | 2,090 | | 1973 | 2,069 | | 1972 | 2,062 | | 1971 | 2,055 | | 1970 | 2,032 | | 1969 | 1,987 | | 1968 | 1,920 | | 1967 | 1,832 | | 1966 | 1,728 | | 1965 | 1,652 | | 1964 | 1,601 | | 1963 | 1,563 | | 1962 | 1,551 | | 1961 | 1,564 | | 1960 | 1,579 |
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