| Year | Value | | 2022 | 3,892 | | 2021 | 3,962 | | 2020 | 3,994 | | 2019 | 3,947 | | 2018 | 3,867 | | 2017 | 3,665 | | 2016 | 3,342 | | 2015 | 3,138 | | 2014 | 3,079 | | 2013 | 3,041 | | 2012 | 3,061 | | 2011 | 3,123 | | 2010 | 3,128 | | 2009 | 3,078 | | 2008 | 3,031 | | 2007 | 2,986 | | 2006 | 2,929 | | 2005 | 2,901 | | 2004 | 2,906 | | 2003 | 2,909 | | 2002 | 2,897 | | 2001 | 2,872 | | 2000 | 2,845 | | 1999 | 2,821 | | 1998 | 2,806 | | 1997 | 2,826 | | 1996 | 2,883 | | 1995 | 2,943 | | 1994 | 2,979 | | 1993 | 2,960 | | 1992 | 2,897 | | 1991 | 2,839 | | 1990 | 2,829 | | 1989 | 2,854 | | 1988 | 2,891 | | 1987 | 2,972 | | 1986 | 3,083 | | 1985 | 3,130 | | 1984 | 3,121 | | 1983 | 3,115 | | 1982 | 3,088 | | 1981 | 3,057 | | 1980 | 3,048 | | 1979 | 3,042 | | 1978 | 3,020 | | 1977 | 3,000 | | 1976 | 2,989 | | 1975 | 2,965 | | 1974 | 2,924 | | 1973 | 2,869 | | 1972 | 2,807 | | 1971 | 2,734 | | 1970 | 2,661 | | 1969 | 2,594 | | 1968 | 2,546 | | 1967 | 2,521 | | 1966 | 2,504 | | 1965 | 2,487 | | 1964 | 2,477 | | 1963 | 2,484 | | 1962 | 2,484 | | 1961 | 2,468 | | 1960 | 2,471 |
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