Year | Value | 2022 | 2.0600785241785 | 2021 | 2.5778546802508 | 2020 | 2.6802339714579 | 2019 | 1.7475728123865 | 2018 | 1.2327130454037 | 2017 | 1.1054653482321 | 2016 | 1.0432584327861 | 2015 | 1.043148025308 | 2014 | 0.88515015832491 | 2013 | 1.3351931773384 | 2012 | 1.1654327053335 | 2011 | 2.538786699798 | 2010 | 2.4600938769821 | 2009 | 1.4323172328353 | 2008 | 1.3473449718971 | 2007 | 1.3944718900447 | 2006 | 1.5034260166436 | 2005 | 1.6843226884793 | 2004 | 1.7661558302093 | 2003 | 1.6916878457644 | 2002 | 1.6346747365242 | 2001 | 1.6832451457488 | 2000 | 1.7646077082256 | 1999 | 2.6557340322538 | 1998 | 2.4423558131661 | 1997 | 2.1167072400794 | 1996 | 2.2109109016917 | 1995 | 2.1015105327424 | 1994 | 2.0157823478837 | 1993 | 1.9313667561152 | 1992 | 1.6591777213548 | 1991 | 2.5079984764807 | 1990 | 2.9685262211412 | 1989 | 2.7299778577117 | 1988 | 2.4598819651422 | 1987 | 2.5860002949635 | 1986 | 2.9059179375109 | 1985 | 2.6617291414752 | 1984 | 2.6266990291262 | 1983 | 2.2185384615385 | 1982 | 1.9759846301633 | 1981 | 1.8880362748518 | 1980 | 2.2172250955701 | 1979 | 1.687200174444 | 1978 | 1.9666499078264 | 1977 | 2.0360680246683 | 1976 | 3.1852840259245 | 1975 | 2.822934973638 | 1974 | 3.6248415716096 | 1973 | 3.495778971604 | 1972 | 4.0621716287215 | 1971 | 3.46866359447 | 1970 | 1.9730290456432 | 1969 | 1.8245810055866 | 1968 | 1.794080604534 | 1967 | 1.6234817813765 | 1966 | 1.4372355430183 | 1965 | 1.1329394387001 | 1964 | 0.65116279069767 | 1963 | 0.36931818181818 | 1962 | 0.11328976034858 |
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