| Year | Value | | 2022 | 251.7048788196 | | 2021 | 211.87122658091 | | 2020 | 195.44497823506 | | 2019 | 182.11233999434 | | 2018 | 183.37168570086 | | 2017 | 188.68252922191 | | 2016 | 162.58372014813 | | 2015 | 154.02356829015 | | 2014 | 145.93208798758 | | 2013 | 139.77452756421 | | 2012 | 129.49524899034 | | 2011 | 109.5921660598 | | 2010 | 100 | | 2009 | 93.90265115924 | | 2008 | 84.93716361309 | | 2007 | 68.273647819668 | | 2006 | 62.976061906752 | | 2005 | 61.293303298034 | | 2004 | 54.12113292231 | | 2003 | 50.030430136297 | | 2002 | 45.216065576027 | | 2001 | 45.842122296227 | | 2000 | 41.943020388257 | | 1999 | 33.707577012007 | | 1998 | 32.603800051027 | | 1997 | 28.981049783929 | | 1996 | 22.104109805297 | | 1995 | 17.482341391462 | | 1994 | 14.658615171182 | | 1993 | 12.76295680981 | | 1992 | 11.636609086125 | | 1991 | 11.428234281067 | | 1990 | 10.484913075272 | | 1989 | 9.7987854991625 | | 1988 | 8.775429971003 | | 1987 | 8.3986017032001 | | 1986 | 7.8408625192175 | | 1985 | 7.711640436232 | | 1984 | 7.4290192353798 | | 1983 | 6.4986202378842 | | 1982 | 6.0088268588262 | | 1981 | 5.6757673610668 | | 1980 | 5.0600866624551 | | 1979 | 4.9367412203844 | | 1978 | 3.6155806727022 | | 1977 | 2.9182473551714 | | 1976 | 2.7315585991635 | | 1975 | 2.5562855612844 | | 1974 | 2.2092198873668 | | 1973 | 1.9090700306008 | | 1972 | 1.8008991406543 | | 1971 | 1.7344930730834 | | 1970 | 1.6701752466354 | | 1969 | 1.6735164324251 | | 1968 | 1.6087809577408 | | 1967 | 1.5168983485275 | | 1966 | 1.5336042774761 | | 1965 | 1.4684511545848 |
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