Year | Value | 2020 | 5.4752979825633 | 2019 | 5.4754824742442 | 2018 | 5.7704270974108 | 2017 | 5.6847997201329 | 2016 | 5.8415642906513 | 2015 | 5.8905673594338 | 2014 | 6.011233347259 | 2013 | 6.1369463123824 | 2012 | 6.2673622874178 | 2011 | 6.4030932626603 | 2010 | 6.5452303213481 | 2009 | 6.6964862838379 | 2008 | 6.8828590337525 | 2007 | 6.5038535332184 | 2005 | 7.3774771298209 | 2004 | 6.3459463825221 | 2003 | 7.2069327177168 | 2002 | 7.3773294067548 | 2001 | 7.8158438319966 | 2000 | 8.0909785589068 | 1999 | 8.3763229271925 | 1998 | 8.7123071710585 | 1997 | 9.1248805075172 | 1996 | 9.5054882878805 | 1995 | 9.7629766230949 | 1994 | 6.2756418804961 | 1993 | 6.4162202046774 | 1992 | 6.3081532881249 | 1991 | 2.3506366307542 | 1990 | 3.4188618608865 |
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