| Year | Value | | 2024 | 83.12233799 | | 2023 | 81.18318755 | | 2022 | 78.63217894 | | 2021 | 75.62650476 | | 2020 | 71.49017499 | | 2019 | 69.632109270521 | | 2018 | 56.659566798129 | | 2017 | 53.031788611098 | | 2016 | 59.540445996726 | | 2015 | 57.431042992363 | | 2014 | 44.385696272341 | | 2013 | 43.46 | | 2012 | 39.75 | | 2011 | 37.176295412518 | | 2010 | 31.05 | | 2009 | 26.34 | | 2008 | 21.71 | | 2007 | 20.81 | | 2006 | 19.52000046 | | 2005 | 17.20999908 | | 2004 | 14.1 | | 2003 | 12.9 | | 2002 | 11.9 | | 2001 | 7.0380231165045 | | 2000 | 5.0813841533807 | | 1999 | 1.86 | | 1998 | 1.27 | | 1997 | 0.627 | | 1996 | 0.2 | | 1995 | 0.103 | | 1994 | 0.0433 | | 1993 | 0.0283 | | 1992 | 0.0173 | | 1991 | 0.00588 |
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