Year | Value | 2021 | 35.857285510118 | 2020 | 31.820209911875 | 2019 | 27.760463345126 | 2018 | 24.820795560503 | 2017 | 21.266644104427 | 2016 | 18.632633842234 | 2015 | 16.007798686943 | 2014 | 13.36505417961 | 2013 | 11.155259696518 | 2012 | 9.2808102353621 | 2011 | 7.5927528508604 | 2010 | 6.1340594506333 | 2009 | 4.3129981002394 | 2008 | 3.6649382991268 | 2007 | 3.3661405682563 | 2006 | 2.6553257777813 | 2005 | 2.0132204805788 | 2004 | 1.4926501142037 | 2003 | 1.1132618313999 | 2002 | 0.83758511524703 | 2001 | 0.65531198526034 | 2000 | 0.51608145917158 | 1999 | 0.37326420940742 | 1998 | 0.24444651395623 | 1997 | 0.13494576309273 | 1996 | 0.072239921157922 | 1995 | 0.051626909558068 | 1994 | 0.018914047485854 | 1993 | 0.0087256559978313 | 1992 | 0.0030064542914084 | 1991 | 0.0010335310823221 |
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