| Year | Value | | 2022 | 72.79637704 | | 2021 | 73.02837449 | | 2020 | 69.79533474 | | 2019 | 65.00690072 | | 2018 | 64.12637682 | | 2017 | 62.25988032 | | 2016 | 58.13649357 | | 2015 | 55.90497251 | | 2014 | 52.57 | | 2013 | 51.7 | | 2012 | 48.98 | | 2011 | 40.35091575 | | 2010 | 36.5 | | 2009 | 30 | | 2008 | 25.6 | | 2007 | 21.8 | | 2006 | 15.34167454 | | 2005 | 11.00726389 | | 2004 | 9.118690303 | | 2003 | 7.388923711 | | 2002 | 4.6 | | 2001 | 2.854199971 | | 2000 | 2.207532993 | | 1999 | 1.697730794 | | 1998 | 1.126225245 | | 1997 | 0.550521023 | | 1996 | 0.330017773 | | 1995 | 0.18804679 | | 1994 | 0.107173945 |
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