| Year | Value | | 2022 | 4,548 | | 2021 | 4,704 | | 2020 | 4,830 | | 2019 | 4,827 | | 2018 | 4,958 | | 2017 | 5,128 | | 2016 | 5,022 | | 2015 | 4,879 | | 2014 | 4,741 | | 2013 | 4,618 | | 2012 | 4,530 | | 2011 | 4,457 | | 2010 | 4,343 | | 2009 | 4,225 | | 2008 | 4,109 | | 2007 | 3,946 | | 2006 | 3,739 | | 2005 | 3,512 | | 2004 | 3,326 | | 2003 | 3,197 | | 2002 | 3,050 | | 2001 | 2,958 | | 2000 | 2,965 | | 1999 | 2,975 | | 1998 | 2,980 | | 1997 | 2,958 | | 1996 | 2,906 | | 1995 | 2,863 | | 1994 | 2,838 | | 1993 | 2,817 | | 1992 | 2,779 | | 1991 | 2,740 | | 1990 | 2,698 | | 1989 | 2,656 | | 1988 | 2,624 | | 1987 | 2,591 | | 1986 | 2,540 | | 1985 | 2,468 | | 1984 | 2,392 | | 1983 | 2,323 | | 1982 | 2,258 | | 1981 | 2,203 | | 1980 | 2,172 | | 1979 | 2,147 | | 1978 | 2,126 | | 1977 | 2,100 | | 1976 | 2,047 | | 1975 | 1,988 | | 1974 | 1,928 | | 1973 | 1,879 | | 1972 | 1,911 | | 1971 | 1,991 | | 1970 | 2,071 | | 1969 | 2,164 | | 1968 | 2,250 | | 1967 | 2,324 | | 1966 | 2,384 | | 1965 | 2,406 | | 1964 | 2,370 | | 1963 | 2,286 | | 1962 | 2,160 | | 1961 | 2,013 | | 1960 | 1,899 |
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