Year | Value | 2022 | 46.206146841678 | 2021 | 45.590210190252 | 2020 | 44.806733014136 | 2019 | 45.035777603856 | 2018 | 43.944335770552 | 2017 | 42.58848624123 | 2016 | 41.243828528626 | 2015 | 39.336215266888 | 2014 | 35.660739352983 | 2013 | 34.855849451347 | 2012 | 34.767525413648 | 2011 | 34.665926883113 | 2010 | 33.833827681264 | 2009 | 33.589713300154 | 2008 | 32.220664482436 | 2007 | 30.816276792678 | 2006 | 29.254925618074 | 2005 | 27.452995313515 | 2004 | 25.567448263359 | 2003 | 22.044631536745 | 2002 | 20.593687219734 | 2001 | 21.007647307446 | 2000 | 18.673252457665 | 1999 | 18.352713873919 | 1998 | 21.217048364035 | 1997 | 18.531701674255 | 1996 | 16.844547379134 | 1995 | 16.906033336228 | 1994 | 16.789565655238 | 1993 | 16.432823944009 | 1992 | 16.346798739985 | 1991 | 16.269594249936 |
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