Year | Value | 2022 | 0.31521935825615 | 2021 | 0.3675663049077 | 2020 | 0.37477067012502 | 2019 | 0.35502751738417 | 2018 | 0.3263751096225 | 2017 | 0.3193186261473 | 2016 | 0.34032987292439 | 2015 | 0.29762549515633 | 2014 | 0.28985260927829 | 2013 | 0.28126154586378 | 2012 | 0.27407991661782 | 2011 | 0.27294960036609 | 2010 | 0.26287917456209 | 2009 | 0.45788664907612 | 2008 | 0.6085356171256 | 2007 | 0.51619354165891 | 2006 | 0.48263447637712 | 2005 | 0.4002351012048 | 2004 | 0.36097903653613 | 2003 | 0.41638126446518 | 2002 | 0.41984658708172 | 2001 | 0.4025923165965 | 2000 | 0.38728249927285 | 1999 | 0.51129914294901 | 1998 | 0.62485522816918 | 1997 | 0.90277252095021 | 1996 | 0.90669365629924 | 1995 | 0.92596593679974 | 1994 | 0.7737940672903 | 1993 | 0.53006715758145 |
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