Year | Value | 2019 | 1.084 | 2018 | 0.947 | 2017 | 0.961 | 2016 | 0.917 | 2015 | 0.876 | 2014 | 0.841 | 2013 | 0.817 | 2012 | 0.796 | 2011 | 0.767 | 2010 | 0.745 | 2009 | 0.734 | 2008 | 0.721 | 2007 | 0.703 | 2005 | 0.725 | 2004 | 0.682 | 2001 | 0.605 | 2000 | 0.595 | 1999 | 0.582 | 1998 | 0.568 | 1997 | 0.555 | 1996 | 0.541 | 1995 | 0.524 | 1994 | 0.512 | 1993 | 0.502 | 1992 | 0.491 | 1991 | 0.48 | 1990 | 0.462 | 1986 | 0.351 | 1982 | 0.342 | 1981 | 0.344 | 1980 | 0.285 | 1975 | 0.233 | 1970 | 0.232 | 1960 | 0.185 |
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