Year | Value | 2021 | 65.668168505121 | 2020 | 62.956166452279 | 2019 | 60.224237820434 | 2018 | 58.175125910321 | 2017 | 51.272075350463 | 2016 | 47.377191447823 | 2015 | 43.371692347129 | 2014 | 39.422868378582 | 2013 | 35.403998793071 | 2012 | 30.508588295899 | 2011 | 27.247641626682 | 2010 | 23.851762101331 | 2009 | 20.477472338644 | 2008 | 18.558521470283 | 2007 | 15.975660220386 | 2006 | 14.13589789659 | 2005 | 12.751073387485 | 2004 | 11.487531159523 | 2003 | 9.7776181282878 | 2002 | 8.4921301257268 | 2001 | 6.5554647994895 | 2000 | 5.3122105470408 | 1999 | 3.2994313289233 | 1998 | 2.4919514525652 | 1997 | 1.4543661289287 | 1996 | 0.84544058615431 | 1995 | 0.43513219128376 | 1994 | 0.1945881775788 | 1993 | 0.065763722758563 | 1992 | 0.029959099049614 | 1991 | 0.0074580820110246 |
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