| Year | Value | | 2021 | 3,749.9003064645 | | 2020 | 3,929.7041282452 | | 2019 | 4,711.7361496425 | | 2018 | 4,908.8163565045 | | 2017 | 4,633.9377536498 | | 2016 | 4,411.8701376904 | | 2015 | 4,148.3590437692 | | 2014 | 4,383.7410828102 | | 2013 | 3,981.8179903718 | | 2012 | 3,660.6198086693 | | 2011 | 3,510.3877303695 | | 2010 | 3,044.2307540449 | | 2009 | 2,904.788256842 | | 2008 | 3,509.3719616391 | | 2007 | 3,369.732685195 | | 2006 | 3,012.0641445608 | | 2005 | 3,131.219461735 | | 2004 | 2,834.7068001295 | | 2003 | 2,398.2485494761 | | 2002 | 1,963.7711972726 | | 2001 | 1,721.5691275776 | | 2000 | 1,801.3756276091 | | 1999 | 1,989.7235945583 | | 1998 | 1,719.035146733 | | 1997 | 2,236.1670819717 | | 1996 | 2,343.1998703102 | | 1995 | 2,151.1801753985 | | 1994 | 1,944.2671752989 | | 1993 | 1,774.1390036751 | | 1992 | 1,663.3574887366 | | 1991 | 1,505.7733064106 | | 1990 | 1,454.3166576347 | | 1989 | 1,331.3722122865 | | 1988 | 1,261.0008111575 | | 1987 | 1,362.1059136592 | | 1986 | 1,539.3687276144 | | 1985 | 1,385.3039516273 | | 1984 | 1,446.2843664371 | | 1983 | 1,405.3761639549 | | 1982 | 1,504.3193343371 | | 1981 | 1,650.0988373429 | | 1980 | 1,643.0577353721 |
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