Year | Value | 2021 | 30.269976726144 | 2020 | 30.269976726144 | 2019 | 30.269976726144 | 2018 | 30.269976726144 | 2017 | 30.269976726144 | 2016 | 30.269976726144 | 2015 | 30.27 | 2014 | 30.27 | 2013 | 30.27 | 2012 | 30.27 | 2011 | 30.27 | 2010 | 30.27 | 2009 | 30.036041117145 | 2008 | 29.802081458495 | 2007 | 29.56812257564 | 2006 | 29.33416291699 | 2005 | 29.100204034135 | 2004 | 28.86624515128 | 2003 | 28.63228549263 | 2002 | 28.398326609775 | 2001 | 28.164366951125 | 2000 | 27.93040806827 | 1999 | 27.696366951125 | 1998 | 27.462326609775 | 1997 | 27.22828549263 | 1996 | 26.99424515128 | 1995 | 26.760204034135 | 1994 | 26.52616291699 | 1993 | 26.29212257564 | 1992 | 26.058081458495 | 1991 | 25.824041117145 | 1990 | 25.59 |
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