Year | Value | 2020 | 1.994 | 2019 | 2.086 | 2018 | 2.103 | 2017 | 2.011 | 2016 | 1.96 | 2015 | 2.127 | 2014 | 2.158 | 2013 | 2.01 | 2012 | 1.995 | 2011 | 1.973 | 2010 | 2.034 | 2009 | 2.062 | 2008 | 1.959 | 2007 | 1.884 | 2006 | 1.788 | 2005 | 1.663 | 2004 | 1.568 | 2003 | 1.532 | 2002 | 1.471 | 2001 | 1.431 | 2000 | 1.39 | 1999 | 0.94 | 1998 | 0.921 | 1997 | 0.856 | 1995 | 1.14 | 1990 | 0.799 | 1989 | 0.883 | 1987 | 0.834 | 1982 | 0.549 | 1965 | 0.038 | 1960 | 0.03 |
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