Year | Value | 2021 | 11.453437562338 | 2020 | 11.659186116098 | 2019 | 11.864901256732 | 2018 | 12.070666267704 | 2017 | 12.276381408338 | 2016 | 12.482096548973 | 2015 | 12.687811689607 | 2014 | 12.893536804309 | 2013 | 13.099261919011 | 2012 | 13.304987033712 | 2011 | 13.510712148414 | 2010 | 13.716437263116 | 2009 | 13.971638056153 | 2008 | 14.178099194235 | 2007 | 14.384560332316 | 2006 | 14.591021470397 | 2005 | 14.797482608478 | 2004 | 15.003943746559 | 2003 | 15.21040488464 | 2002 | 15.416866022722 | 2001 | 15.623327160803 | 2000 | 15.829788298884 | 1999 | 16.036244432211 | 1998 | 16.242700565537 | 1997 | 16.449156698864 | 1996 | 16.655612832191 | 1995 | 16.862068965517 | 1994 | 17.068525098844 | 1993 | 17.274981232171 | 1992 | 17.481437365497 | 1991 | 17.687893498824 | 1990 | 17.894349632151 |
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