| Year | Value | | 2022 | 16,139 | | 2021 | 15,686 | | 2020 | 15,327 | | 2019 | 14,871 | | 2018 | 14,336 | | 2017 | 13,864 | | 2016 | 13,483 | | 2015 | 13,185 | | 2014 | 12,970 | | 2013 | 12,785 | | 2012 | 12,574 | | 2011 | 12,333 | | 2010 | 12,085 | | 2009 | 11,847 | | 2008 | 11,620 | | 2007 | 11,357 | | 2006 | 11,073 | | 2005 | 10,803 | | 2004 | 10,549 | | 2003 | 10,310 | | 2002 | 10,100 | | 2001 | 9,886 | | 2000 | 9,663 | | 1999 | 9,435 | | 1998 | 9,225 | | 1997 | 9,047 | | 1996 | 8,929 | | 1995 | 8,853 | | 1994 | 8,741 | | 1993 | 8,570 | | 1992 | 8,388 | | 1991 | 8,247 | | 1990 | 8,160 | | 1989 | 8,078 | | 1988 | 7,997 | | 1987 | 7,920 | | 1986 | 7,736 | | 1985 | 7,462 | | 1984 | 7,197 | | 1983 | 6,930 | | 1982 | 6,672 | | 1981 | 6,436 | | 1980 | 6,228 | | 1979 | 5,926 | | 1978 | 5,617 | | 1977 | 5,447 | | 1976 | 5,374 | | 1975 | 5,340 | | 1974 | 5,289 | | 1973 | 5,204 | | 1972 | 5,093 | | 1971 | 4,970 | | 1970 | 4,868 | | 1969 | 4,811 | | 1968 | 4,780 | | 1967 | 4,738 | | 1966 | 4,646 | | 1965 | 4,534 | | 1964 | 4,461 | | 1963 | 4,397 | | 1962 | 4,339 | | 1961 | 4,293 | | 1960 | 4,259 |
|