Year | Value | 2021 | 58.156447631482 | 2020 | 54.193685799901 | 2019 | 47.467416536468 | 2018 | 42.18136491308 | 2017 | 38.284358305458 | 2016 | 35.788154170085 | 2015 | 32.996354645961 | 2014 | 30.360292283919 | 2013 | 28.072611903686 | 2012 | 25.957121873194 | 2011 | 23.450120725382 | 2010 | 20.578369716945 | 2009 | 17.05281406552 | 2008 | 14.14929194532 | 2007 | 11.401158470529 | 2006 | 8.8311457249913 | 2005 | 7.2257556690594 | 2004 | 6.116303514342 | 2003 | 4.774359200397 | 2002 | 3.663265589276 | 2001 | 2.1853640607643 | 2000 | 1.5592852566494 | 1999 | 0.78080477059644 | 1998 | 0.40305860340481 | 1997 | 0.18039981175663 | 1996 | 0.093769729494656 | 1995 | 0.039996419161189 | 1994 | 0.014561635640585 | 1993 | 0.0053685679842389 | 1992 | 0.0018416212442705 | 1991 | 0.00039484566359102 |
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