| Year | Value | | 2022 | 14,115 | | 2021 | 13,279 | | 2020 | 12,528 | | 2019 | 11,773 | | 2018 | 11,160 | | 2017 | 10,869 | | 2016 | 10,819 | | 2015 | 10,924 | | 2014 | 11,187 | | 2013 | 11,423 | | 2012 | 11,414 | | 2011 | 11,235 | | 2010 | 10,995 | | 2009 | 10,744 | | 2008 | 10,499 | | 2007 | 10,287 | | 2006 | 10,123 | | 2005 | 10,003 | | 2004 | 9,918 | | 2003 | 9,875 | | 2002 | 9,811 | | 2001 | 9,690 | | 2000 | 9,545 | | 1999 | 9,380 | | 1998 | 9,193 | | 1997 | 8,989 | | 1996 | 8,783 | | 1995 | 8,583 | | 1994 | 8,409 | | 1993 | 8,262 | | 1992 | 8,085 | | 1991 | 7,831 | | 1990 | 7,520 | | 1989 | 7,177 | | 1988 | 6,795 | | 1987 | 6,396 | | 1986 | 6,041 | | 1985 | 5,762 | | 1984 | 5,550 | | 1983 | 5,398 | | 1982 | 5,290 | | 1981 | 5,189 | | 1980 | 5,070 | | 1979 | 4,937 | | 1978 | 4,793 | | 1977 | 4,641 | | 1976 | 4,487 | | 1975 | 4,335 | | 1974 | 4,184 | | 1973 | 4,047 | | 1972 | 3,929 | | 1971 | 3,816 | | 1970 | 3,709 | | 1969 | 3,607 | | 1968 | 3,507 | | 1967 | 3,410 | | 1966 | 3,320 | | 1965 | 3,233 | | 1964 | 3,149 | | 1963 | 3,067 | | 1962 | 2,987 | | 1961 | 2,911 | | 1960 | 2,836 |
|