Year | Value | 2022 | 26.980685541499 | 2021 | 26.650589192425 | 2020 | 24.676350008085 | 2019 | 25.616826914674 | 2018 | 25.831111803069 | 2017 | 25.006956037841 | 2016 | 23.956323568994 | 2015 | 22.919564030237 | 2014 | 22.051095989902 | 2013 | 21.197808912329 | 2012 | 20.368095180284 | 2011 | 20.584998359034 | 2010 | 20.774656517762 | 2009 | 19.246108316841 | 2008 | 17.846846628998 | 2007 | 17.560944028176 | 2006 | 17.285963161148 | 2005 | 17.000011576199 | 2004 | 17.227576608696 | 2003 | 17.445535053721 | 2002 | 17.703206266507 | 2001 | 17.980999550853 | 2000 | 18.299983673569 | 1999 | 18.410521057203 | 1998 | 18.569610541199 | 1997 | 18.722933157751 | 1996 | 18.800917914937 | 1995 | 18.865538233097 | 1994 | 18.957694982082 | 1993 | 19.016911997002 | 1992 | 19.110520323254 | 1991 | 19.173077575161 |
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