| Year | Value | | 2021 | 230,080 | | 2020 | 230,080 | | 2019 | 230,080 | | 2018 | 230,080 | | 2017 | 230,080 | | 2016 | 230,080 | | 2015 | 230,080 | | 2014 | 230,080 | | 2013 | 230,030 | | 2012 | 230,020 | | 2011 | 230,170 | | 2010 | 230,050 | | 2009 | 230,060 | | 2008 | 229,900 | | 2007 | 229,890 | | 2006 | 229,980 | | 2005 | 229,980 | | 2004 | 230,000 | | 2003 | 229,950 | | 2002 | 229,870 | | 2001 | 229,710 | | 2000 | 229,710 | | 1999 | 229,600 | | 1998 | 229,590 | | 1997 | 229,530 | | 1996 | 229,520 | | 1995 | 229,490 | | 1994 | 229,510 | | 1993 | 229,460 | | 1992 | 229,460 | | 1991 | 229,460 | | 1990 | 229,350 | | 1989 | 229,350 | | 1988 | 230,340 | | 1987 | 230,340 | | 1986 | 230,340 | | 1985 | 230,340 | | 1984 | 230,340 | | 1983 | 230,340 | | 1982 | 230,340 | | 1981 | 230,340 | | 1980 | 230,340 | | 1979 | 230,340 | | 1978 | 230,340 | | 1977 | 230,340 | | 1976 | 230,340 | | 1975 | 230,340 | | 1974 | 230,340 |
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