Year | Value | 2021 | 4.2090216010165 | 2020 | 4.2090216010165 | 2019 | 4.2090216010165 | 2018 | 4.2090216010165 | 2017 | 4.2090216010165 | 2016 | 4.2090216010165 | 2015 | 4.1296060991105 | 2014 | 4.1296060991105 | 2013 | 3.9707750952986 | 2012 | 3.6928208386277 | 2011 | 3.4148665819568 | 2010 | 3.3354510800508 | 2009 | 3.1766200762389 | 2008 | 3.0972045743329 | 2007 | 3.0972045743329 | 2006 | 3.0972045743329 | 2005 | 3.0972045743329 | 2004 | 3.0177890724269 | 2003 | 3.0177890724269 | 2002 | 2.938373570521 | 2001 | 2.938373570521 | 2000 | 2.858958068615 | 1999 | 2.858958068615 | 1998 | 2.858958068615 | 1997 | 2.858958068615 | 1996 | 2.7001270648031 | 1995 | 2.7160101651842 | 1994 | 2.6921855146124 | 1993 | 2.6763024142313 | 1992 | 2.6540660736976 | 1991 | 2.6381829733164 | 1990 | 2.5992693773825 | 1989 | 2.5595616264295 | 1988 | 2.5436785260483 | 1987 | 2.5254129606099 | 1986 | 2.5254129606099 | 1985 | 2.4857052096569 | 1984 | 2.4833227445998 | 1983 | 2.4857052096569 | 1982 | 2.487293519695 | 1981 | 2.4896759847522 | 1980 | 2.4912642947903 | 1979 | 2.4936467598475 | 1978 | 2.4960292249047 | 1977 | 2.4579097839898 | 1976 | 2.4579097839898 | 1975 | 2.380082592122 | 1974 | 2.3158145442998 | 1973 | 2.3071428571429 | 1972 | 2.2992063492063 | 1971 | 2.2992063492063 | 1970 | 2.2992063492063 | 1969 | 2.2992063492063 | 1968 | 2.2992063492063 | 1967 | 2.2992063492063 | 1966 | 2.2992063492063 | 1965 | 2.2992063492063 | 1964 | 2.2992063492063 | 1963 | 2.2992063492063 | 1962 | 2.2992063492063 | 1961 | 2.2992063492063 |
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