| Year | Value | | 2022 | 16,176 | | 2021 | 15,550 | | 2020 | 15,006 | | 2019 | 14,510 | | 2018 | 14,079 | | 2017 | 13,707 | | 2016 | 13,391 | | 2015 | 13,197 | | 2014 | 13,135 | | 2013 | 13,124 | | 2012 | 13,134 | | 2011 | 13,144 | | 2010 | 13,116 | | 2009 | 13,028 | | 2008 | 12,871 | | 2007 | 12,653 | | 2006 | 12,404 | | 2005 | 12,127 | | 2004 | 11,821 | | 2003 | 11,480 | | 2002 | 11,104 | | 2001 | 10,706 | | 2000 | 10,323 | | 1999 | 9,953 | | 1998 | 9,646 | | 1997 | 9,444 | | 1996 | 9,278 | | 1995 | 9,125 | | 1994 | 8,977 | | 1993 | 8,772 | | 1992 | 8,493 | | 1991 | 8,198 | | 1990 | 7,909 | | 1989 | 7,629 | | 1988 | 7,366 | | 1987 | 7,136 | | 1986 | 6,940 | | 1985 | 6,775 | | 1984 | 6,640 | | 1983 | 6,533 | | 1982 | 6,448 | | 1981 | 6,383 | | 1980 | 6,331 | | 1979 | 6,309 | | 1978 | 6,250 | | 1977 | 6,097 | | 1976 | 5,910 | | 1975 | 5,718 | | 1974 | 5,522 | | 1973 | 5,326 | | 1972 | 5,126 | | 1971 | 4,926 | | 1970 | 4,731 | | 1969 | 4,542 | | 1968 | 4,382 | | 1967 | 4,239 | | 1966 | 4,091 | | 1965 | 3,953 | | 1964 | 3,828 | | 1963 | 3,697 | | 1962 | 3,576 | | 1961 | 3,490 | | 1960 | 3,418 |
|