Year | Value | 2022 | 5.5382121463919 | 2021 | 6.0247735962353 | 2020 | 16.776075764119 | 2019 | 13.227230082225 | 2018 | 11.649117041934 | 2017 | 13.120978065445 | 2016 | 6.0444366894942 | 2015 | 16.289069043057 | 2014 | 22.938534140632 | 2013 | 19.198708400336 | 2012 | 14.972869534218 | 2011 | 14.768088775779 | 2010 | 18.570492209949 | 2009 | 16.528033116033 | 2008 | 26.666057069065 | 2007 | 28.260117470777 | 2006 | 35.489356173582 | 2005 | 30.493101649086 | 2004 | 30.285057786429 | 2003 | 26.029509662027 | 2002 | 26.265176722246 | 2001 | 22.327758553747 | 2000 | 27.645114672387 | 1999 | 23.70845948896 | 1998 | 26.611080821926 | 1997 | 24.749433238094 | 1996 | 27.803931571872 | 1995 | 30.49313390226 | 1994 | 29.402630395782 | 1993 | 25.714487392199 | 1992 | 28.877412815848 | 1991 | 26.690699712509 | 1990 | 37.816984258669 |
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