Year | Value | 2021 | 1.192 | 2020 | 1.212 | 2019 | 1.137 | 2018 | 0.988 | 2017 | 0.911 | 2016 | 0.876 | 2015 | 0.845 | 2014 | 0.819 | 2013 | 0.781 | 2012 | 0.747 | 2011 | 0.723 | 2010 | 0.71 | 2009 | 0.671 | 2008 | 0.615 | 2007 | 0.549 | 2006 | 0.517 | 2005 | 0.518 | 2004 | 0.538 | 2001 | 0.443 | 2000 | 0.424 | 1999 | 0.375 | 1998 | 0.346 | 1997 | 0.305 | 1996 | 0.279 | 1995 | 0.223 | 1994 | 0.186 | 1993 | 0.208 | 1992 | 0.167 | 1991 | 0.14 | 1989 | 0.146 | 1985 | 0.181 | 1982 | 0.134 | 1981 | 0.134 | 1975 | 0.169 | 1970 | 0.169 | 1965 | 0.172 | 1960 | 0.223 |
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