Year | Value | 2022 | 32.86897105684 | 2021 | 33.645728027763 | 2020 | 33.206878941419 | 2019 | 34.730044978422 | 2018 | 34.551944637754 | 2017 | 33.912956687357 | 2016 | 34.299394854318 | 2015 | 32.332164402203 | 2014 | 31.462834765167 | 2013 | 30.822998958152 | 2012 | 30.138316306308 | 2011 | 29.24315682468 | 2010 | 28.546630952906 | 2009 | 28.205969439119 | 2008 | 27.939838953038 | 2007 | 27.739936175641 | 2006 | 27.454562281436 | 2005 | 27.248925512001 | 2004 | 26.75642389251 | 2003 | 26.475970325487 | 2002 | 26.234882520192 | 2001 | 25.989930996986 | 2000 | 25.797864917237 | 1999 | 25.745613160141 | 1998 | 25.816679508034 | 1997 | 25.839535282915 | 1996 | 25.596525283675 | 1995 | 25.643387981702 | 1994 | 25.825201873042 | 1993 | 25.837255797106 | 1992 | 25.925833931407 | 1991 | 25.978507320598 |
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