| Year | Value | | 2021 | 12,252.241925264 | | 2020 | 10,722.816078326 | | 2019 | 14,365.202120832 | | 2018 | 13,828.277874426 | | 2017 | 13,164.307749819 | | 2016 | 12,565.307491281 | | 2015 | 12,366.610170174 | | 2014 | 12,397.87370056 | | 2013 | 12,257.323412666 | | 2012 | 9,920.3390101807 | | 2011 | 9,931.3090339972 | | 2010 | 9,049.8479426255 | | 2009 | 8,053.5153136454 | | 2008 | 9,006.1704451188 | | 2007 | 9,958.3197262151 | | 2006 | 10,718.147833945 | | 2005 | 9,907.91197162 | | 2004 | 9,165.318892343 | | 2003 | 7,058.8372525531 | | 2002 | 6,564.849617483 | | 2001 | 6,587.35241422 | | 2000 | 6,311.2341327149 | | 1999 | 6,532.6416930989 | | 1998 | 6,581.3820016653 | | 1997 | 6,334.1614448128 | | 1996 | 5,742.126077961 | | 1995 | 5,881.0697625281 | | 1994 | 5,926.0579273684 | | 1993 | 5,860.8442996166 | | 1992 | 5,497.7325401022 | | 1991 | 4,576.0090642754 | | 1990 | 4,669.0815005329 |
|