| Year | Value | | 2022 | 3,474 | | 2021 | 3,469 | | 2020 | 3,490 | | 2019 | 3,472 | | 2018 | 3,407 | | 2017 | 3,336 | | 2016 | 3,254 | | 2015 | 3,152 | | 2014 | 3,029 | | 2013 | 2,887 | | 2012 | 2,737 | | 2011 | 2,597 | | 2010 | 2,477 | | 2009 | 2,386 | | 2008 | 2,319 | | 2007 | 2,256 | | 2006 | 2,183 | | 2005 | 2,092 | | 2004 | 1,990 | | 2003 | 1,884 | | 2002 | 1,789 | | 2001 | 1,710 | | 2000 | 1,651 | | 1999 | 1,602 | | 1998 | 1,557 | | 1997 | 1,517 | | 1996 | 1,480 | | 1995 | 1,446 | | 1994 | 1,410 | | 1993 | 1,373 | | 1992 | 1,337 | | 1991 | 1,301 | | 1990 | 1,267 | | 1989 | 1,235 | | 1988 | 1,206 | | 1987 | 1,177 | | 1986 | 1,145 | | 1985 | 1,109 | | 1984 | 1,068 | | 1983 | 1,023 | | 1982 | 967 | | 1981 | 913 | | 1980 | 875 | | 1979 | 862 | | 1978 | 873 | | 1977 | 895 | | 1976 | 938 | | 1975 | 991 | | 1974 | 1,034 | | 1973 | 1,071 | | 1972 | 1,101 | | 1971 | 1,132 | | 1970 | 1,167 | | 1969 | 1,195 | | 1968 | 1,197 | | 1967 | 1,177 | | 1966 | 1,156 | | 1965 | 1,141 | | 1964 | 1,132 | | 1963 | 1,130 | | 1962 | 1,131 | | 1961 | 1,132 | | 1960 | 1,129 |
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