Year | Value | 2022 | 19,354 | 2021 | 18,443 | 2020 | 17,761 | 2019 | 17,209 | 2018 | 16,608 | 2017 | 16,026 | 2016 | 15,391 | 2015 | 14,859 | 2014 | 14,402 | 2013 | 13,960 | 2012 | 13,552 | 2011 | 13,260 | 2010 | 12,855 | 2009 | 12,316 | 2008 | 11,775 | 2007 | 11,258 | 2006 | 10,794 | 2005 | 10,458 | 2004 | 10,343 | 2003 | 10,205 | 2002 | 10,022 | 2001 | 9,963 | 2000 | 10,088 | 1999 | 10,038 | 1998 | 9,873 | 1997 | 9,815 | 1996 | 9,831 | 1995 | 10,032 | 1994 | 10,316 | 1993 | 10,536 | 1992 | 10,650 | 1991 | 10,574 | 1990 | 10,185 | 1989 | 9,573 | 1988 | 8,977 | 1987 | 8,381 | 1986 | 7,871 | 1985 | 7,619 | 1984 | 7,501 | 1983 | 7,289 | 1982 | 7,089 | 1981 | 7,008 | 1980 | 6,913 | 1979 | 7,042 | 1978 | 7,498 | 1977 | 8,071 | 1976 | 8,590 | 1975 | 8,976 | 1974 | 9,120 | 1973 | 9,155 | 1972 | 9,241 | 1971 | 9,328 | 1970 | 9,347 | 1969 | 9,338 | 1968 | 9,312 | 1967 | 9,218 | 1966 | 9,157 | 1965 | 9,126 | 1964 | 9,025 | 1963 | 8,899 | 1962 | 8,692 | 1961 | 8,349 | 1960 | 7,968 |
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