Year | Value | 2021 | 51.949567135171 | 2020 | 48.176940218496 | 2019 | 39.591887624293 | 2018 | 32.750217608056 | 2017 | 29.897140594817 | 2016 | 27.127517197315 | 2015 | 24.419889334729 | 2014 | 21.434753538145 | 2013 | 18.962083176027 | 2012 | 17.074584937315 | 2011 | 15.343364191232 | 2010 | 12.79050772388 | 2009 | 9.6776624361587 | 2008 | 8.4903759870925 | 2007 | 7.3282757261516 | 2006 | 5.762820429679 | 2005 | 4.8842473246087 | 2004 | 4.2160439532002 | 2003 | 3.4016724578816 | 2002 | 2.8261782721483 | 2001 | 1.6822351766615 | 2000 | 1.2286408463142 | 1999 | 0.61076342499688 | 1998 | 0.34241108256208 | 1997 | 0.1632429991836 | 1996 | 0.080798132029794 | 1995 | 0.040927061757454 | 1994 | 0.011675261382491 | 1993 | 0.0055895554568646 | 1992 | 0.002426085087345 | 1991 | 0.0010026830099331 | 1990 | 0.00026064045592378 |
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