| Year | Value | | 2022 | 9,828 | | 2021 | 9,968 | | 2020 | 10,129 | | 2019 | 9,950 | | 2018 | 9,544 | | 2017 | 9,324 | | 2016 | 9,227 | | 2015 | 9,207 | | 2014 | 9,271 | | 2013 | 9,388 | | 2012 | 9,532 | | 2011 | 9,738 | | 2010 | 9,995 | | 2009 | 10,238 | | 2008 | 10,449 | | 2007 | 10,600 | | 2006 | 10,657 | | 2005 | 10,621 | | 2004 | 10,520 | | 2003 | 10,382 | | 2002 | 10,231 | | 2001 | 10,095 | | 2000 | 9,969 | | 1999 | 9,842 | | 1998 | 9,717 | | 1997 | 9,597 | | 1996 | 9,484 | | 1995 | 9,384 | | 1994 | 9,287 | | 1993 | 9,181 | | 1992 | 9,049 | | 1991 | 8,876 | | 1990 | 8,648 | | 1989 | 8,362 | | 1988 | 8,043 | | 1987 | 7,707 | | 1986 | 7,363 | | 1985 | 7,020 | | 1984 | 6,685 | | 1983 | 6,356 | | 1982 | 6,040 | | 1981 | 5,745 | | 1980 | 5,477 | | 1979 | 5,245 | | 1978 | 5,054 | | 1977 | 4,895 | | 1976 | 4,764 | | 1975 | 4,642 | | 1974 | 4,518 | | 1973 | 4,394 | | 1972 | 4,270 | | 1971 | 4,146 | | 1970 | 4,029 | | 1969 | 3,924 | | 1968 | 3,817 | | 1967 | 3,697 | | 1966 | 3,563 | | 1965 | 3,425 | | 1964 | 3,307 | | 1963 | 3,225 | | 1962 | 3,189 | | 1961 | 3,211 | | 1960 | 3,278 |
|