Year | Value | 2021 | 11,957 | 2020 | 11,957 | 2019 | 11,957 | 2018 | 11,957 | 2017 | 12,052 | 2016 | 12,141 | 2015 | 12,230 | 2014 | 12,142 | 2013 | 12,184 | 2012 | 12,222 | 2011 | 12,260 | 2010 | 12,299 | 2009 | 12,337 | 2008 | 12,375 | 2007 | 12,413 | 2006 | 12,169 | 2005 | 12,186 | 2004 | 12,807 | 2003 | 12,547 | 2002 | 12,637 | 2001 | 12,777 | 2000 | 12,867 | 1999 | 12,957 | 1998 | 12,698 | 1997 | 12,410 | 1996 | 12,461 | 1995 | 12,902 | 1994 | 12,943 | 1993 | 12,964 | 1992 | 13,015 | 1991 | 12,837 | 1990 | 12,708 | 1989 | 12,629 | 1988 | 12,680 | 1987 | 12,531 | 1986 | 12,582 | 1985 | 12,433 | 1984 | 12,285 | 1983 | 12,236 | 1982 | 12,327 | 1981 | 12,668 | 1980 | 13,119 | 1979 | 13,070 | 1978 | 12,622 | 1977 | 12,263 | 1976 | 12,224 | 1975 | 12,355 | 1974 | 12,306 | 1973 | 12,257 | 1972 | 12,238 | 1971 | 12,260 | 1970 | 11,881 | 1969 | 11,952 | 1968 | 12,023 | 1967 | 12,134 | 1966 | 12,235 | 1965 | 12,347 | 1964 | 12,438 | 1963 | 12,519 | 1962 | 12,520 | 1961 | 12,520 |
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