| Year | Value | | 2022 | 16,834 | | 2021 | 16,770 | | 2020 | 16,568 | | 2019 | 16,270 | | 2018 | 15,964 | | 2017 | 15,619 | | 2016 | 15,202 | | 2015 | 14,727 | | 2014 | 14,220 | | 2013 | 13,737 | | 2012 | 13,359 | | 2011 | 13,055 | | 2010 | 12,735 | | 2009 | 12,339 | | 2008 | 11,894 | | 2007 | 11,392 | | 2006 | 10,813 | | 2005 | 10,180 | | 2004 | 9,541 | | 2003 | 8,981 | | 2002 | 8,499 | | 2001 | 8,069 | | 2000 | 7,711 | | 1999 | 7,447 | | 1998 | 7,223 | | 1997 | 7,024 | | 1996 | 6,800 | | 1995 | 6,566 | | 1994 | 6,308 | | 1993 | 6,021 | | 1992 | 5,803 | | 1991 | 5,618 | | 1990 | 5,413 | | 1989 | 5,184 | | 1988 | 4,951 | | 1987 | 4,744 | | 1986 | 4,583 | | 1985 | 4,470 | | 1984 | 4,376 | | 1983 | 4,229 | | 1982 | 4,016 | | 1981 | 3,771 | | 1980 | 3,528 | | 1979 | 3,297 | | 1978 | 3,101 | | 1977 | 2,962 | | 1976 | 2,858 | | 1975 | 2,799 | | 1974 | 2,790 | | 1973 | 2,841 | | 1972 | 2,842 | | 1971 | 2,671 | | 1970 | 2,425 | | 1969 | 2,216 | | 1968 | 2,050 | | 1967 | 1,915 | | 1966 | 1,808 | | 1965 | 1,744 | | 1964 | 1,745 | | 1963 | 1,819 | | 1962 | 1,815 | | 1961 | 1,592 | | 1960 | 1,339 |
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