Year | Value | 2022 | 12.826019651731 | 2021 | 13.219894299961 | 2020 | 13.503332093387 | 2019 | 12.741688901491 | 2018 | 13.057684669308 | 2017 | 12.612016680985 | 2016 | 12.496562633144 | 2015 | 12.389810906321 | 2014 | 11.808379079221 | 2013 | 11.62350459903 | 2012 | 11.664427363104 | 2011 | 11.803921281262 | 2010 | 11.732809298183 | 2009 | 12.304385954864 | 2008 | 12.390165596485 | 2007 | 13.334432006896 | 2006 | 13.348220669342 | 2005 | 13.299492885698 | 2004 | 13.344747867074 | 2003 | 13.228934713272 | 2002 | 13.377627468507 | 2001 | 14.181479814947 | 2000 | 14.857743184611 | 1999 | 14.6999207276 | 1998 | 14.668397589042 | 1997 | 14.567728347824 | 1996 | 13.878492825359 | 1995 | 13.287062255523 | 1994 | 13.073694524554 | 1993 | 13.652335828078 | 1992 | 14.308859801012 | 1991 | 14.397675601655 | 1990 | 14.112129242086 |
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