Year | Value | 2021 | 24,192.527809475 | 2020 | 21,338.490601194 | 2019 | 28,943.05051137 | 2018 | 27,555.399115373 | 2017 | 27,762.097913863 | 2016 | 26,210.583701003 | 2015 | 26,400.915327464 | 2014 | 25,392.941579041 | 2013 | 24,588.787967577 | 2012 | 25,479.101358785 | 2011 | 24,095.782815363 | 2010 | 24,433.757475633 | 2009 | 24,748.425018407 | 2008 | 26,739.158338612 | 2007 | 27,043.009058818 | 2006 | 26,203.111942543 | 2005 | 25,908.065411164 | 2004 | 24,209.362863868 | 2003 | 24,017.986566524 | 2002 | 24,323.989396699 | 2001 | 23,003.520429225 | 2000 | 22,788.578939888 | 1999 | 22,134.37507589 | 1998 | 19,849.668969662 | 1997 | 18,794.086179197 | 1996 | 13,886.789645156 | 1995 | 12,253.373441296 | 1994 | 9,899.9878078376 | 1993 | 9,660.9288600802 | 1992 | 10,131.216652872 | 1991 | 10,020.062480638 | 1990 | 10,373.148828534 | 1989 | 10,419.917294742 | 1988 | 9,569.4085645709 | 1987 | 9,321.8235051457 | 1986 | 8,557.667544057 | 1985 | 8,219.2477261829 | 1984 | 7,327.4821704294 | 1983 | 6,314.141662852 | 1982 | 5,835.3576567785 | 1981 | 5,238.5931029141 | 1980 | 5,098.2970414786 |
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