| Year | Value | | 2022 | 14,219 | | 2021 | 13,791 | | 2020 | 13,501 | | 2019 | 13,323 | | 2018 | 13,247 | | 2017 | 13,264 | | 2016 | 13,336 | | 2015 | 13,404 | | 2014 | 13,420 | | 2013 | 13,356 | | 2012 | 13,208 | | 2011 | 12,976 | | 2010 | 12,656 | | 2009 | 12,239 | | 2008 | 11,743 | | 2007 | 11,211 | | 2006 | 10,648 | | 2005 | 10,065 | | 2004 | 9,461 | | 2003 | 8,824 | | 2002 | 8,158 | | 2001 | 7,484 | | 2000 | 6,836 | | 1999 | 6,284 | | 1998 | 5,831 | | 1997 | 5,437 | | 1996 | 5,116 | | 1995 | 4,877 | | 1994 | 4,727 | | 1993 | 4,666 | | 1992 | 4,685 | | 1991 | 4,780 | | 1990 | 4,947 | | 1989 | 5,120 | | 1988 | 5,268 | | 1987 | 5,419 | | 1986 | 5,565 | | 1985 | 5,698 | | 1984 | 5,811 | | 1983 | 5,891 | | 1982 | 5,937 | | 1981 | 5,945 | | 1980 | 5,942 | | 1979 | 5,926 | | 1978 | 5,877 | | 1977 | 5,807 | | 1976 | 5,720 | | 1975 | 5,629 | | 1974 | 5,548 | | 1973 | 5,474 | | 1972 | 5,400 | | 1971 | 5,329 | | 1970 | 5,251 | | 1969 | 5,133 | | 1968 | 4,998 | | 1967 | 4,887 | | 1966 | 4,802 | | 1965 | 4,739 | | 1964 | 4,695 | | 1963 | 4,669 | | 1962 | 4,656 | | 1961 | 4,677 | | 1960 | 4,709 |
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