Year | Value | 2017 | 1.261 | 2016 | 1.241 | 2015 | 1.268 | 2014 | 1.236 | 2010 | 1.193 | 2008 | 1.08 | 2007 | 0.998 | 2005 | 0.907 | 2004 | 1.295 | 2003 | 0.803 | 2002 | 0.789 | 2001 | 0.777 | 2000 | 0.752 | 1999 | 0.73 | 1998 | 0.705 | 1997 | 0.676 | 1996 | 0.655 | 1995 | 0.642 | 1994 | 0.585 | 1993 | 0.586 | 1992 | 0.579 | 1991 | 0.522 | 1990 | 0.524 | 1986 | 0.461 | 1981 | 0.275 | 1980 | 0.271 | 1975 | 0.169 | 1970 | 0.169 | 1965 | 0.125 | 1960 | 0.1 |
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