Year | Value | 2022 | 23,411 | 2021 | 23,104 | 2020 | 22,944 | 2019 | 22,826 | 2018 | 22,760 | 2017 | 22,792 | 2016 | 22,876 | 2015 | 23,021 | 2014 | 23,282 | 2013 | 23,658 | 2012 | 23,993 | 2011 | 24,117 | 2010 | 23,952 | 2009 | 23,456 | 2008 | 22,678 | 2007 | 21,809 | 2006 | 21,066 | 2005 | 20,589 | 2004 | 20,496 | 2003 | 20,705 | 2002 | 21,008 | 2001 | 21,263 | 2000 | 21,360 | 1999 | 21,289 | 1998 | 21,116 | 1997 | 20,947 | 1996 | 20,861 | 1995 | 20,871 | 1994 | 21,024 | 1993 | 21,367 | 1992 | 21,699 | 1991 | 21,810 | 1990 | 21,631 | 1989 | 21,020 | 1988 | 19,992 | 1987 | 18,791 | 1986 | 17,531 | 1985 | 16,269 | 1984 | 15,162 | 1983 | 14,262 | 1982 | 13,526 | 1981 | 12,904 | 1980 | 12,364 | 1979 | 12,170 | 1978 | 12,191 | 1977 | 12,042 | 1976 | 11,795 | 1975 | 11,521 | 1974 | 11,271 | 1973 | 11,067 | 1972 | 10,922 | 1971 | 10,764 | 1970 | 10,610 | 1969 | 10,535 | 1968 | 10,504 | 1967 | 10,497 | 1966 | 10,521 | 1965 | 10,532 | 1964 | 10,465 | 1963 | 10,334 | 1962 | 10,134 | 1961 | 9,847 | 1960 | 9,504 |
|