Year | Value | 2021 | 30.115829276773 | 2020 | 30.115829276773 | 2019 | 30.115829276773 | 2018 | 30.115829276773 | 2017 | 30.115829276773 | 2016 | 30.115829276773 | 2015 | 29.993741307371 | 2014 | 29.658240611961 | 2013 | 29.329113593879 | 2012 | 28.994800452135 | 2011 | 28.64053525655 | 2010 | 28.319930449902 | 2009 | 28.253933756411 | 2008 | 28.208786428882 | 2007 | 28.145199878203 | 2006 | 28.069397338899 | 2005 | 28.004609096443 | 2004 | 27.937391304348 | 2003 | 27.87866927593 | 2002 | 27.823552442685 | 2001 | 27.778067998781 | 2000 | 27.713203604545 | 1999 | 27.728658536585 | 1998 | 27.732044078575 | 1997 | 27.741471703045 | 1996 | 27.744858835831 | 1995 | 27.750664516972 | 1994 | 27.750424818091 | 1993 | 27.758650745228 | 1992 | 27.760829774253 | 1991 | 27.763008803277 | 1990 | 27.778504469152 |
|