Year | Value | 2022 | 68.978347722293 | 2021 | 68.804558427509 | 2020 | 68.668624193108 | 2019 | 69.343873456753 | 2018 | 69.465237848602 | 2017 | 69.318896741485 | 2016 | 69.078194817844 | 2015 | 68.928601589316 | 2014 | 69.055705062791 | 2013 | 68.965514647608 | 2012 | 68.00919631316 | 2011 | 67.027820252203 | 2010 | 67.101213383566 | 2009 | 67.136710212073 | 2008 | 67.407508269869 | 2007 | 67.338115143433 | 2006 | 67.129607740717 | 2005 | 66.655086017562 | 2004 | 65.794062599705 | 2003 | 64.920072972974 | 2002 | 63.293475612755 | 2001 | 61.727381808589 | 2000 | 61.456291739438 | 1999 | 60.759027882316 | 1998 | 60.272220181143 | 1997 | 60.186688701713 | 1996 | 60.015186209647 | 1995 | 59.891780654985 | 1994 | 59.855757275236 | 1993 | 59.872920005468 | 1992 | 59.981904778951 | 1991 | 60.195332005552 |
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