Year | Value | 2022 | 1.1412449815116 | 2021 | 1.2776160023174 | 2020 | 1.3487295703207 | 2019 | 1.3365748080822 | 2018 | 1.3739702211506 | 2017 | 1.4069138158407 | 2016 | 1.4249835223372 | 2015 | 1.4220035710818 | 2014 | 1.4065439694274 | 2013 | 1.3803585664956 | 2012 | 1.3492384381685 | 2011 | 1.2973385436549 | 2010 | 1.1514018484516 | 2009 | 1.0121236706903 | 2008 | 0.97911891421871 | 2007 | 0.99723788248596 | 2006 | 1.049761659739 | 2005 | 1.1117874017366 | 2004 | 1.1712756254531 | 2003 | 1.2545929192833 | 2002 | 1.428308173769 | 2001 | 1.6975529938096 | 2000 | 1.926945241577 | 1999 | 2.0621305861907 | 1998 | 2.1590415377905 | 1997 | 2.2379659438068 | 1996 | 2.3131763456058 | 1995 | 2.3874833921032 | 1994 | 2.4568924407466 | 1993 | 2.5199951147078 | 1992 | 2.5828408661938 | 1991 | 2.6450666665392 | 1990 | 2.6943076381126 | 1989 | 2.741443340179 | 1988 | 2.7795599844327 | 1987 | 2.7939966434837 | 1986 | 2.8037435659087 | 1985 | 2.7995673516474 | 1984 | 2.7907328250315 | 1983 | 2.7779993811362 | 1982 | 2.7555700428202 | 1981 | 2.703918253889 | 1980 | 2.6159018172767 | 1979 | 2.53381967833 | 1978 | 2.4907810294152 | 1977 | 2.4776895160288 | 1976 | 2.4726178594093 | 1975 | 2.4832584458631 | 1974 | 2.482214869081 | 1973 | 2.4156320427599 | 1972 | 2.316159691541 | 1971 | 2.2572237036144 | 1970 | 2.2530770495232 | 1969 | 2.2863309452413 | 1968 | 2.3296017507818 | 1967 | 2.3816172203201 | 1966 | 2.4338922450807 | 1965 | 2.4712210076668 | 1964 | 2.4915155573566 | 1963 | 2.4829721808474 | 1962 | 2.4510562021931 | 1961 | 2.4181862706874 |
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