Year | Value | 2022 | 1.079363741488 | 2021 | 1.11985399101 | 2020 | 1.1998596223322 | 2019 | 1.241514631057 | 2018 | 1.3156368204825 | 2017 | 1.415369332646 | 2016 | 1.4620698661924 | 2015 | 1.4994097236156 | 2014 | 1.5530182714316 | 2013 | 1.5874398043598 | 2012 | 1.6181313184673 | 2011 | 1.6110434292447 | 2010 | 1.7582874032315 | 2009 | 1.978923413826 | 2008 | 2.0881853201788 | 2007 | 2.1760898040312 | 2006 | 2.2348595535249 | 2005 | 2.3033638215154 | 2004 | 2.3720084635771 | 2003 | 2.4426064365775 | 2002 | 2.5163474215978 | 2001 | 2.5701435302749 | 2000 | 2.5445936670592 | 1999 | 2.5267217636269 | 1998 | 2.607521862124 | 1997 | 2.6713589132674 | 1996 | 2.7051266156806 | 1995 | 2.7600334463766 | 1994 | 2.7881878956765 | 1993 | 2.7857776897181 | 1992 | 2.7871856905092 | 1991 | 2.8166589072616 | 1990 | 2.8777395694329 | 1989 | 2.954637704123 | 1988 | 3.0195625512795 | 1987 | 3.003298382836 | 1986 | 2.9389198134177 | 1985 | 2.8307768126464 | 1984 | 2.7165320542592 | 1983 | 2.6359677216516 | 1982 | 2.5937558891781 | 1981 | 2.6056969260149 | 1980 | 2.6117745517643 | 1979 | 2.6054447041256 | 1978 | 2.6247956383658 | 1977 | 2.5600713141814 | 1976 | 2.4834126678431 | 1975 | 2.4639276275913 | 1974 | 2.4335946314377 | 1973 | 2.3879804780329 | 1972 | 2.332783007905 | 1971 | 2.3592659857548 | 1970 | 2.4040994077239 | 1969 | 2.4180235236375 | 1968 | 2.465899746996 | 1967 | 2.5563365740322 | 1966 | 2.7045274721521 | 1965 | 2.8460875602347 | 1964 | 2.9467644463863 | 1963 | 3.0189055533858 | 1962 | 3.0420377310179 | 1961 | 3.030331277282 |
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