Year | Value | 2022 | 23.130359638767 | 2021 | 23.345897676169 | 2020 | 22.798166354011 | 2019 | 25.870096152158 | 2018 | 25.536171017059 | 2017 | 23.459581351738 | 2016 | 23.483360283659 | 2015 | 22.275400161042 | 2014 | 21.093654551243 | 2013 | 19.992870256283 | 2012 | 18.945274274701 | 2011 | 17.729139286701 | 2010 | 16.574949369611 | 2009 | 16.368219326034 | 2008 | 16.18844403961 | 2007 | 16.04475401868 | 2006 | 15.886647222599 | 2005 | 15.706725124918 | 2004 | 15.587259251059 | 2003 | 15.440416384866 | 2002 | 15.379045631503 | 2001 | 15.308548029074 | 2000 | 15.303514547852 | 1999 | 15.1752185072 | 1998 | 15.109062057546 | 1997 | 15.06754209308 | 1996 | 15.023250429452 | 1995 | 14.994757590168 | 1994 | 14.954992355305 | 1993 | 14.93132016138 | 1992 | 14.937965268531 | 1991 | 14.936328039878 |
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