Year | Value | 2021 | 34.696390278771 | 2020 | 34.651715511079 | 2019 | 34.604567221785 | 2018 | 34.559895647202 | 2017 | 34.51519548281 | 2016 | 34.381391608891 | 2015 | 34.343506539919 | 2014 | 34.336359087985 | 2013 | 34.329211636052 | 2012 | 34.322064184118 | 2011 | 34.314916732185 | 2010 | 34.307769280252 | 2009 | 34.245229075835 | 2008 | 34.182688871417 | 2007 | 34.120148667 | 2006 | 34.057608462583 | 2005 | 33.995068258166 | 2004 | 33.932528053749 | 2003 | 33.869987849332 | 2002 | 33.838889683789 | 2001 | 33.776291314923 | 2000 | 33.713692946058 | 1999 | 33.652298336612 | 1998 | 33.589697728492 | 1997 | 33.48517327617 | 1996 | 33.422650946767 | 1995 | 33.401895904132 | 1994 | 33.339295296011 | 1993 | 33.276694687891 | 1992 | 33.214094079771 |
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