Year | Value | 2022 | 74.609925161633 | 2021 | 74.329931321799 | 2020 | 74.086597863763 | 2019 | 74.409204086303 | 2018 | 73.955996721077 | 2017 | 73.512712163824 | 2016 | 73.354458776225 | 2015 | 73.605199251938 | 2014 | 72.091690169825 | 2013 | 72.095683591099 | 2012 | 71.449639350608 | 2011 | 71.218434071181 | 2010 | 68.525584019996 | 2009 | 69.061720033157 | 2008 | 70.039143222177 | 2007 | 69.856402766549 | 2006 | 68.240513318238 | 2005 | 69.062788583608 | 2004 | 69.877587542151 | 2003 | 70.569657824565 | 2002 | 71.310319584911 | 2001 | 72.130494132791 | 2000 | 72.754634193555 | 1999 | 73.308421344399 | 1998 | 73.816471599834 | 1997 | 74.374881613599 | 1996 | 74.798008034857 | 1995 | 75.23206276981 | 1994 | 75.770489156263 | 1993 | 75.845007308345 | 1992 | 75.937905984039 | 1991 | 75.91671281669 |
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