| Year | Value | | 2022 | 22,523 | | 2021 | 22,292 | | 2020 | 21,743 | | 2019 | 20,766 | | 2018 | 19,455 | | 2017 | 18,053 | | 2016 | 16,779 | | 2015 | 15,850 | | 2014 | 15,369 | | 2013 | 15,256 | | 2012 | 15,311 | | 2011 | 15,300 | | 2010 | 14,908 | | 2009 | 14,066 | | 2008 | 12,959 | | 2007 | 11,792 | | 2006 | 10,789 | | 2005 | 10,037 | | 2004 | 9,489 | | 2003 | 9,128 | | 2002 | 8,861 | | 2001 | 8,521 | | 2000 | 8,093 | | 1999 | 7,706 | | 1998 | 7,411 | | 1997 | 7,146 | | 1996 | 6,911 | | 1995 | 6,707 | | 1994 | 6,527 | | 1993 | 6,365 | | 1992 | 6,217 | | 1991 | 6,080 | | 1990 | 5,947 | | 1989 | 5,809 | | 1988 | 5,666 | | 1987 | 5,519 | | 1986 | 5,370 | | 1985 | 5,215 | | 1984 | 5,056 | | 1983 | 4,890 | | 1982 | 4,679 | | 1981 | 4,446 | | 1980 | 4,274 | | 1979 | 4,183 | | 1978 | 4,179 | | 1977 | 4,230 | | 1976 | 4,343 | | 1975 | 4,494 | | 1974 | 4,636 | | 1973 | 4,773 | | 1972 | 4,902 | | 1971 | 5,022 | | 1970 | 5,125 | | 1969 | 5,186 | | 1968 | 5,167 | | 1967 | 5,101 | | 1966 | 5,036 | | 1965 | 4,969 | | 1964 | 4,902 | | 1963 | 4,833 | | 1962 | 4,765 | | 1961 | 4,704 | | 1960 | 4,651 |
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