Year | Value | 2021 | 68.6990689582 | 2020 | 68.699070307611 | 2019 | 68.699060524388 | 2018 | 68.694498135379 | 2017 | 68.694498135379 | 2016 | 68.694498135379 | 2015 | 68.694498135379 | 2014 | 68.735259538906 | 2013 | 68.780921672992 | 2012 | 68.826583807078 | 2011 | 68.872245941164 | 2010 | 68.91790807525 | 2009 | 68.94000265626 | 2008 | 68.962097237269 | 2007 | 68.984191818278 | 2006 | 69.006286399288 | 2005 | 69.028380980297 | 2004 | 69.050475561307 | 2003 | 69.072570142316 | 2002 | 69.094664723325 | 2001 | 69.116759304335 | 2000 | 69.138853885344 | 1999 | 69.114304350889 | 1998 | 69.089754816435 | 1997 | 69.06520528198 | 1996 | 69.040655747525 | 1995 | 69.01610621307 | 1994 | 68.991556678615 | 1993 | 68.96700714416 | 1992 | 68.942457609705 | 1991 | 68.91790807525 | 1990 | 68.893358540795 |
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