| Year | Value | | 2022 | 15,188 | | 2021 | 14,609 | | 2020 | 14,158 | | 2019 | 13,801 | | 2018 | 13,528 | | 2017 | 13,331 | | 2016 | 13,192 | | 2015 | 13,072 | | 2014 | 12,921 | | 2013 | 12,725 | | 2012 | 12,482 | | 2011 | 12,172 | | 2010 | 11,777 | | 2009 | 11,209 | | 2008 | 10,468 | | 2007 | 9,657 | | 2006 | 8,816 | | 2005 | 7,994 | | 2004 | 7,201 | | 2003 | 6,439 | | 2002 | 5,712 | | 2001 | 5,027 | | 2000 | 4,390 | | 1999 | 3,879 | | 1998 | 3,495 | | 1997 | 3,172 | | 1996 | 2,915 | | 1995 | 2,737 | | 1994 | 2,642 | | 1993 | 2,622 | | 1992 | 2,669 | | 1991 | 2,780 | | 1990 | 2,949 | | 1989 | 3,109 | | 1988 | 3,234 | | 1987 | 3,363 | | 1986 | 3,490 | | 1985 | 3,610 | | 1984 | 3,716 | | 1983 | 3,803 | | 1982 | 3,872 | | 1981 | 3,921 | | 1980 | 4,004 | | 1979 | 4,137 | | 1978 | 4,260 | | 1977 | 4,357 | | 1976 | 4,432 | | 1975 | 4,490 | | 1974 | 4,548 | | 1973 | 4,611 | | 1972 | 4,666 | | 1971 | 4,700 | | 1970 | 4,679 | | 1969 | 4,585 | | 1968 | 4,457 | | 1967 | 4,345 | | 1966 | 4,252 | | 1965 | 4,179 | | 1964 | 4,124 | | 1963 | 4,084 | | 1962 | 4,057 | | 1961 | 4,069 | | 1960 | 4,086 |
|