| Year | Value | | 2022 | 27,433 | | 2021 | 27,749 | | 2020 | 26,810 | | 2019 | 24,884 | | 2018 | 23,924 | | 2017 | 23,913 | | 2016 | 23,866 | | 2015 | 23,104 | | 2014 | 22,063 | | 2013 | 21,016 | | 2012 | 19,234 | | 2011 | 16,880 | | 2010 | 14,796 | | 2009 | 14,218 | | 2008 | 14,737 | | 2007 | 14,933 | | 2006 | 14,719 | | 2005 | 14,145 | | 2004 | 13,374 | | 2003 | 13,017 | | 2002 | 13,084 | | 2001 | 13,049 | | 2000 | 12,915 | | 1999 | 12,731 | | 1998 | 12,500 | | 1997 | 12,228 | | 1996 | 11,933 | | 1995 | 11,632 | | 1994 | 11,330 | | 1993 | 10,896 | | 1992 | 10,357 | | 1991 | 9,873 | | 1990 | 9,435 | | 1989 | 9,024 | | 1988 | 8,633 | | 1987 | 8,265 | | 1986 | 7,926 | | 1985 | 7,624 | | 1984 | 7,340 | | 1983 | 7,065 | | 1982 | 6,815 | | 1981 | 6,585 | | 1980 | 6,370 | | 1979 | 6,169 | | 1978 | 5,976 | | 1977 | 5,794 | | 1976 | 5,633 | | 1975 | 5,493 | | 1974 | 5,369 | | 1973 | 5,265 | | 1972 | 5,177 | | 1971 | 5,088 | | 1970 | 4,998 | | 1969 | 4,910 | | 1968 | 4,826 | | 1967 | 4,743 | | 1966 | 4,655 | | 1965 | 4,556 | | 1964 | 4,446 | | 1963 | 4,324 | | 1962 | 4,196 | | 1961 | 4,073 | | 1960 | 3,964 |
|