Year | Value | 2022 | 16.975234830843 | 2021 | 16.641169428164 | 2020 | 16.387835672653 | 2019 | 16.518450864777 | 2018 | 16.532479410185 | 2017 | 16.599240441076 | 2016 | 16.53694800608 | 2015 | 16.353551011304 | 2014 | 16.31372512133 | 2013 | 16.2355881565 | 2012 | 16.16208287356 | 2011 | 16.092631900264 | 2010 | 16.012051383942 | 2009 | 15.941811160103 | 2008 | 15.84747443977 | 2007 | 15.668581940261 | 2006 | 15.578803942973 | 2005 | 15.421962161558 | 2004 | 15.166617793903 | 2003 | 14.95875447603 | 2002 | 14.795245750737 | 2001 | 14.629235752342 | 2000 | 14.482324970899 | 1999 | 14.455452689456 | 1998 | 14.431696026743 | 1997 | 14.613625056953 | 1996 | 14.84285300612 | 1995 | 15.003502502564 | 1994 | 15.166832154438 | 1993 | 15.307015408366 | 1992 | 15.457647383345 | 1991 | 15.580366992619 |
|