Year | Value | 2021 | 23.087719298246 | 2020 | 23.040935672515 | 2019 | 23.120467836257 | 2018 | 23.040935672515 | 2017 | 22.970760233918 | 2016 | 23.073383942949 | 2015 | 22.843340234645 | 2014 | 22.406257188866 | 2013 | 22.199217851392 | 2012 | 22.550129747582 | 2011 | 22.316584100024 | 2010 | 22.382637414484 | 2009 | 21.981599433829 | 2008 | 21.39183769757 | 2007 | 21.575843359283 | 2006 | 21.196036801132 | 2005 | 20.804435008257 | 2004 | 18.174097664543 | 2003 | 19.549422033499 | 2002 | 16.470865770229 | 2001 | 20.995517810804 | 2000 | 23.260202878037 | 1999 | 23.614059919792 | 1998 | 24.604859636707 | 1997 | 24.1330502477 | 1996 | 23.708421797594 | 1995 | 23.378155225289 | 1994 | 25.973106864827 | 1993 | 31.139419674451 | 1992 | 32.41330502477 |
|