| Year | Value | | 2021 | 9,343.4297548826 | | 2020 | 8,190.5344740984 | | 2019 | 9,452.2565533061 | | 2018 | 9,653.7069424977 | | 2017 | 9,206.6299963417 | | 2016 | 8,702.5843208069 | | 2015 | 8,985.4355923883 | | 2014 | 10,081.689138485 | | 2013 | 9,692.145096348 | | 2012 | 9,199.348467276 | | 2011 | 8,710.1147961533 | | 2010 | 7,519.553722413 | | 2009 | 6,951.7489626782 | | 2008 | 8,154.7730434218 | | 2007 | 6,937.3810044374 | | 2006 | 5,922.058109999 | | 2005 | 5,089.6367109072 | | 2004 | 4,532.0822783133 | | 2003 | 3,906.488133986 | | 2002 | 3,327.2223359155 | | 2001 | 3,152.3034169725 | | 2000 | 3,075.2643197105 | | 1999 | 2,901.4648840259 | | 1998 | 2,836.3032712444 | | 1997 | 2,840.4152966827 | | 1996 | 2,668.1154513332 | | 1995 | 2,584.4550866746 | | 1994 | 2,283.5262056109 | | 1993 | 2,220.4279072163 | | 1992 | 2,228.5612138553 | | 1991 | 2,134.7469108501 | | 1990 | 1,991.0206882611 | | 1989 | 1,821.9255757506 | | 1988 | 1,850.9095175448 | | 1987 | 1,659.0282883726 | | 1986 | 1,583.8872144442 | | 1985 | 1,608.6878327575 | | 1984 | 1,697.7690189235 | | 1983 | 1,848.3614353395 | | 1982 | 1,947.0442131743 | | 1981 | 1,754.1092361177 | | 1980 | 1,510.6805610214 |
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