Year | Value | 2022 | 18,674 | 2021 | 18,712 | 2020 | 18,749 | 2019 | 18,670 | 2018 | 18,487 | 2017 | 18,260 | 2016 | 17,719 | 2015 | 17,155 | 2014 | 16,639 | 2013 | 16,288 | 2012 | 15,930 | 2011 | 15,360 | 2010 | 14,842 | 2009 | 14,475 | 2008 | 14,129 | 2007 | 13,882 | 2006 | 13,719 | 2005 | 13,512 | 2004 | 13,322 | 2003 | 13,050 | 2002 | 12,873 | 2001 | 12,826 | 2000 | 12,583 | 1999 | 12,289 | 1998 | 12,207 | 1997 | 12,338 | 1996 | 12,616 | 1995 | 12,810 | 1994 | 12,970 | 1993 | 13,222 | 1992 | 13,434 | 1991 | 13,681 | 1990 | 13,950 | 1989 | 14,159 | 1988 | 14,390 | 1987 | 14,674 | 1986 | 14,865 | 1985 | 14,918 | 1984 | 14,929 | 1983 | 14,924 | 1982 | 14,855 | 1981 | 14,744 | 1980 | 14,642 | 1979 | 14,522 | 1978 | 14,398 | 1977 | 14,245 | 1976 | 13,947 | 1975 | 13,541 | 1974 | 13,061 | 1973 | 12,539 | 1972 | 12,001 | 1971 | 11,501 | 1970 | 11,114 | 1969 | 10,835 | 1968 | 10,654 | 1967 | 10,582 | 1966 | 10,533 | 1965 | 10,536 | 1964 | 10,613 | 1963 | 10,646 | 1962 | 10,543 | 1961 | 10,413 | 1960 | 10,447 |
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