Year | Value | 2022 | 0.16667318835934 | 2021 | 0.16643435205026 | 2020 | 0.16161535100625 | 2019 | 0.14879673818804 | 2018 | 0.15638529978182 | 2017 | 0.16537629451361 | 2016 | 0.17470175595371 | 2015 | 0.14230191763118 | 2014 | 0.1510174821594 | 2013 | 0.18873323776996 | 2012 | 0.14279440115901 | 2011 | 0.15203525209665 | 2010 | 0.14868958978039 | 2009 | 0.16777718367403 | 2008 | 0.15595207103506 | 2007 | 0.14272503928122 | 2006 | 0.15385650827837 | 2005 | 0.16067405184987 | 2004 | 0.16621684973624 | 2003 | 0.1871027738672 | 2002 | 0.19627003388307 | 2001 | 0.194580389103 | 2000 | 0.20071881608958 | 1999 | 0.2081352833638 | 1998 | 0.20281481777653 | 1997 | 0.2340788927524 | 1996 | 0.29339018437529 | 1995 | 0.33282560109329 | 1994 | 0.33314555753763 | 1993 | 0.3302542019725 | 1992 | 0.35442407333599 | 1991 | 0.36742178589798 | 1990 | 0.3460953346856 | 1989 | 0.29001622888742 | 1988 | 0.21964229683087 | 1987 | 0.19403847741722 | 1986 | 0.19796954314721 | 1985 | 0.21964135275003 | 1984 | 0.25208913649025 | 1983 | 0.26913735015279 | 1982 | 0.26226012793177 | 1981 | 0.46674502889607 | 1980 | 0.48924916637921 | 1979 | 0.20484293193717 | 1978 | 0.1725790987536 | 1977 | 0.17273061374495 | 1976 | 0.18707482993197 | 1975 | 0.19174473067916 | 1974 | 0.13992537313433 | 1973 | 0.1889848812095 | 1972 | 0.20251396648045 | 1971 | 0.22394487510767 | 1970 | 0.21946564885496 | 1969 | 0.18050193050193 | 1968 | 0.15579710144927 |
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