| Year | Value | | 2019 | 7,891.2588153149 | | 2018 | 7,586.049673846 | | 2017 | 7,366.4162540597 | | 2016 | 6,957.9003840116 | | 2015 | 6,645.2668273387 | | 2014 | 6,107.3384536268 | | 2013 | 5,830.573378457 | | 2012 | 5,495.469328845 | | 2011 | 5,164.6668817409 | | 2010 | 4,438.6562144369 | | 2009 | 4,318.1251618918 | | 2008 | 4,228.496915941 | | 2007 | 4,022.4140685455 | | 2006 | 3,740.4099527309 | | 2005 | 3,263.984854305 | | 2004 | 2,915.3009616095 | | 2003 | 2,759.4326464235 | | 2002 | 2,581.8848380569 | | 2001 | 2,439.7958616635 | | 2000 | 2,338.7719189623 | | 1999 | 2,198.3656413763 | | 1998 | 2,009.0232286226 | | 1997 | 1,974.670203421 | | 1996 | 1,954.162518686 | | 1995 | 2,398.6094588141 | | 1994 | 2,281.1278418661 | | 1993 | 1,812.2191033685 | | 1992 | 1,792.2429817527 | | 1991 | 1,977.1282170785 | | 1990 | 2,343.838796844 | | 1989 | 2,233.3832771859 | | 1988 | 2,287.0970704828 | | 1987 | 2,118.2507309585 | | 1986 | 2,055.3747722838 | | 1985 | 1,959.9105947118 | | 1984 | 2,092.0444660759 | | 1983 | 1,947.3985024151 | | 1982 | 1,849.9577411636 | | 1981 | 1,792.7314760897 | | 1980 | 1,781.9364678991 | | 1979 | 1,772.7061336525 | | 1978 | 1,627.5157064332 | | 1977 | 1,303.2117951751 | | 1976 | 1,275.5226790803 |
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