Year | Value | 2021 | 28.998255813953 | 2020 | 28.927906976744 | 2019 | 28.857558139535 | 2018 | 28.787209302326 | 2017 | 28.716860465116 | 2016 | 28.646511627907 | 2015 | 28.575581395349 | 2014 | 28.505 | 2013 | 28.434418604651 | 2012 | 28.363837209302 | 2011 | 28.293255813954 | 2010 | 28.222674418605 | 2009 | 28.152034883721 | 2008 | 28.081395348837 | 2007 | 28.010755813954 | 2006 | 27.94011627907 | 2005 | 27.869476744186 | 2004 | 27.798837209302 | 2003 | 27.728197674419 | 2002 | 27.657558139535 | 2001 | 27.586918604651 | 2000 | 27.516279069767 | 1999 | 27.445697674419 | 1998 | 27.37511627907 | 1997 | 27.304534883721 | 1996 | 27.233953488372 | 1995 | 27.163372093023 | 1994 | 27.092790697674 | 1993 | 27.022209302326 | 1992 | 26.951627906977 | 1991 | 26.881046511628 | 1990 | 26.810465116279 |
|