Year | Value | 2021 | 68.217881190181 | 2020 | 65.508498140525 | 2019 | 62.303980709895 | 2018 | 59.320269378213 | 2017 | 51.902146054797 | 2016 | 47.469815839644 | 2015 | 43.771725400737 | 2014 | 40.204342403266 | 2013 | 36.419435392181 | 2012 | 32.235894887753 | 2011 | 29.574119151332 | 2010 | 25.468353281236 | 2009 | 22.144996191011 | 2008 | 19.772436443603 | 2007 | 17.174402515782 | 2006 | 15.041542844147 | 2005 | 13.386409983478 | 2004 | 11.913088353636 | 2003 | 10.224608899024 | 2002 | 8.6774697485624 | 2001 | 6.3120127654465 | 2000 | 4.7983271851482 | 1999 | 3.0534330802529 | 1998 | 2.2279277591628 | 1997 | 1.2412685654182 | 1996 | 0.71458639350455 | 1995 | 0.34385447846034 | 1994 | 0.13874856705905 | 1993 | 0.045731430376675 | 1992 | 0.02069278773701 | 1991 | 0.0051359430691026 |
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