Year | Value | 2021 | 1.16 | 2020 | 1.18 | 2019 | 1.3 | 2018 | 1.21 | 2017 | 1.25 | 2016 | 1.76 | 2015 | 1.76 | 2014 | 1.78 | 2013 | 2.9 | 2012 | 2.76 | 2011 | 1.8 | 2010 | 2.3 | 2009 | 2.33 | 2008 | 4.79 | 2007 | 4.82 | 2006 | 4.74 | 2005 | 8.46 | 2004 | 23.27 | 2002 | 23.65 | 2001 | 24.08 | 2000 | 22.4 | 1999 | 31 | 1998 | 31.08 | 1997 | 32.71 | 1996 | 31.93 | 1995 | 34.7 |
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