Year | Value | 2022 | 35.209360099053 | 2021 | 34.883633361434 | 2020 | 34.666696047446 | 2019 | 34.833671292494 | 2018 | 35.515452348712 | 2017 | 35.796968127922 | 2016 | 36.054108932219 | 2015 | 36.332605450135 | 2014 | 36.666097400941 | 2013 | 33.818547831795 | 2012 | 31.032055082615 | 2011 | 28.101866249924 | 2010 | 28.078891570281 | 2009 | 27.573851351728 | 2008 | 27.869993720465 | 2007 | 27.186974954414 | 2006 | 26.139593237781 | 2005 | 25.506776578268 | 2004 | 24.550570879788 | 2003 | 23.999450012966 | 2002 | 23.703788624663 | 2001 | 24.01084838016 | 2000 | 23.974919985012 | 1999 | 23.784100374131 | 1998 | 22.992070033182 | 1997 | 22.693892475097 | 1996 | 22.710231954686 | 1995 | 22.637235549736 | 1994 | 22.790128695722 | 1993 | 22.751437752231 | 1992 | 23.021491940349 | 1991 | 23.131789479492 |
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