| Year | Value | | 2022 | 18,938 | | 2021 | 17,756 | | 2020 | 16,547 | | 2019 | 15,429 | | 2018 | 14,352 | | 2017 | 13,465 | | 2016 | 12,713 | | 2015 | 11,918 | | 2014 | 10,669 | | 2013 | 8,991 | | 2012 | 7,851 | | 2011 | 7,312 | | 2010 | 6,897 | | 2009 | 6,386 | | 2008 | 5,856 | | 2007 | 5,518 | | 2006 | 5,336 | | 2005 | 5,259 | | 2004 | 5,212 | | 2003 | 5,132 | | 2002 | 4,994 | | 2001 | 4,808 | | 2000 | 4,596 | | 1999 | 4,389 | | 1998 | 4,202 | | 1997 | 4,049 | | 1996 | 3,926 | | 1995 | 3,835 | | 1994 | 3,783 | | 1993 | 3,726 | | 1992 | 3,617 | | 1991 | 3,475 | | 1990 | 3,316 | | 1989 | 3,141 | | 1988 | 2,967 | | 1987 | 2,805 | | 1986 | 2,664 | | 1985 | 2,540 | | 1984 | 2,426 | | 1983 | 2,323 | | 1982 | 2,224 | | 1981 | 2,129 | | 1980 | 2,050 | | 1979 | 1,978 | | 1978 | 1,901 | | 1977 | 1,825 | | 1976 | 1,752 | | 1975 | 1,684 | | 1974 | 1,627 | | 1973 | 1,585 | | 1972 | 1,548 | | 1971 | 1,504 | | 1970 | 1,440 | | 1969 | 1,355 | | 1968 | 1,266 | | 1967 | 1,175 | | 1966 | 1,091 | | 1965 | 1,022 | | 1964 | 1,007 | | 1963 | 1,036 | | 1962 | 1,067 | | 1961 | 1,091 | | 1960 | 1,101 |
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