| Year | Value | | 2022 | 3,383 | | 2021 | 3,325 | | 2020 | 3,248 | | 2019 | 3,164 | | 2018 | 3,097 | | 2017 | 3,067 | | 2016 | 3,082 | | 2015 | 3,132 | | 2014 | 3,207 | | 2013 | 3,289 | | 2012 | 3,353 | | 2011 | 3,376 | | 2010 | 3,359 | | 2009 | 3,309 | | 2008 | 3,233 | | 2007 | 3,143 | | 2006 | 3,049 | | 2005 | 2,954 | | 2004 | 2,854 | | 2003 | 2,739 | | 2002 | 2,615 | | 2001 | 2,487 | | 2000 | 2,356 | | 1999 | 2,230 | | 1998 | 2,115 | | 1997 | 2,020 | | 1996 | 1,944 | | 1995 | 1,875 | | 1994 | 1,815 | | 1993 | 1,764 | | 1992 | 1,711 | | 1991 | 1,660 | | 1990 | 1,594 | | 1989 | 1,521 | | 1988 | 1,474 | | 1987 | 1,453 | | 1986 | 1,446 | | 1985 | 1,442 | | 1984 | 1,443 | | 1983 | 1,447 | | 1982 | 1,454 | | 1981 | 1,462 | | 1980 | 1,484 | | 1979 | 1,518 | | 1978 | 1,548 | | 1977 | 1,572 | | 1976 | 1,592 | | 1975 | 1,609 | | 1974 | 1,627 | | 1973 | 1,645 | | 1972 | 1,662 | | 1971 | 1,678 | | 1970 | 1,691 | | 1969 | 1,698 | | 1968 | 1,701 | | 1967 | 1,702 | | 1966 | 1,700 | | 1965 | 1,696 | | 1964 | 1,692 | | 1963 | 1,685 | | 1962 | 1,676 | | 1961 | 1,665 | | 1960 | 1,652 |
|