Year | Value | 2020 | 17,191.269814417 | 2019 | 18,774.707463675 | 2018 | 18,425.341042518 | 2017 | 18,636.574103275 | 2016 | 17,895.102273405 | 2015 | 17,185.115638978 | 2014 | 17,401.90747624 | 2013 | 17,460.764877928 | 2012 | 17,353.238375238 | 2011 | 13,149.738231022 | 2010 | 13,918.803269799 | 2009 | 13,028.644172093 | 2008 | 15,701.519709563 | 2007 | 14,975.580277239 | 2006 | 13,198.271675405 | 2005 | 12,190.774272448 | 2004 | 11,008.744718815 | 2003 | 9,997.8976777625 | 2002 | 8,853.0715694531 | 2001 | 8,533.7605944219 | 2000 | 8,632.0941908461 | 1999 | 6,607.0188151263 | 1998 | 6,880.7549134214 | 1997 | 6,718.7081614151 | 1996 | 6,787.1263451898 | 1995 | 6,941.1267115864 | 1994 | 6,513.3009403641 | 1993 | 6,080.6566114374 | 1992 | 5,880.3757433485 | 1991 | 6,271.8153965949 | 1990 | 4,726.9065949418 | 1989 | 3,720.0478075624 | 1988 | 4,133.1232909274 | 1987 | 3,239.7794933037 | 1986 | 3,300.1905358914 | 1985 | 3,496.0205595921 | 1984 | 5,297.7852989684 | 1983 | 5,864.2067361479 | 1982 | 5,517.150054373 | 1981 | 3,365.4484502676 | 1980 | 1,931.2493458573 |
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