Year | Value | 2021 | 33.458149175063 | 2020 | 33.435359677176 | 2019 | 33.339906982859 | 2018 | 33.31726502843 | 2017 | 33.294533622916 | 2016 | 33.271099733249 | 2015 | 33.245643988196 | 2014 | 33.231810861444 | 2013 | 33.209086604688 | 2012 | 33.176725695699 | 2011 | 33.155370108749 | 2010 | 33.134014521799 | 2009 | 33.137026207138 | 2008 | 33.140037892477 | 2007 | 33.143049577816 | 2006 | 33.146061263156 | 2005 | 33.149072948495 | 2004 | 33.152084633834 | 2003 | 33.155096319173 | 2002 | 33.158108004512 | 2001 | 33.161119689851 | 2000 | 33.16413137519 | 1999 | 33.16933337714 | 1998 | 33.174535379089 | 1997 | 33.179737381038 | 1996 | 33.184939382988 | 1995 | 33.190141384937 | 1994 | 33.195343386887 | 1993 | 33.200545388836 | 1992 | 33.205747390785 | 1991 | 33.210949392735 | 1990 | 33.216151394684 |
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