Year | Value | 2020 | 0.928 | 2019 | 0.897 | 2018 | 0.786 | 2017 | 0.788 | 2016 | 0.435 | 2015 | 0.455 | 2010 | 0.384 | 2009 | 0.334 | 2008 | 0.313 | 2007 | 0.293 | 2006 | 0.285 | 2004 | 0.29 | 2002 | 0.296 | 2001 | 0.298 | 1999 | 0.291 | 1998 | 0.291 | 1997 | 0.272 | 1995 | 0.239 | 1993 | 0.236 | 1991 | 0.228 | 1990 | 0.225 | 1988 | 0.21 | 1986 | 0.182 | 1984 | 0.16 | 1980 | 0.147 |
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