Year | Value | 2022 | 49.233053336502 | 2021 | 49.239254841603 | 2020 | 49.251097785691 | 2019 | 49.251663536011 | 2018 | 49.24241651913 | 2017 | 49.230740941998 | 2016 | 49.217377561083 | 2015 | 49.201428854116 | 2014 | 49.184309961645 | 2013 | 49.167713076476 | 2012 | 49.149799115081 | 2011 | 49.130822038536 | 2010 | 49.120237574512 | 2009 | 49.119227251306 | 2008 | 49.117661078173 | 2007 | 49.114155606031 | 2006 | 49.110722847509 | 2005 | 49.106379238879 | 2004 | 49.101181882102 | 2003 | 49.097287858106 | 2002 | 49.096422636334 | 2001 | 49.09649507329 | 2000 | 49.092640955757 | 1999 | 49.085696882291 | 1998 | 49.080850792182 | 1997 | 49.077648236472 | 1996 | 49.07480352618 | 1995 | 49.071981855791 | 1994 | 49.068377183338 | 1993 | 49.063655083539 | 1992 | 49.0581027682 | 1991 | 49.051205717725 | 1990 | 49.042993813492 | 1989 | 49.034665405864 | 1988 | 49.027962039626 | 1987 | 49.022541623049 | 1986 | 49.016523542303 | 1985 | 49.010952627559 | 1984 | 49.007791228501 | 1983 | 49.005779767873 | 1982 | 49.004611160669 | 1981 | 49.005519506101 | 1980 | 49.005926796404 | 1979 | 49.010698971016 | 1978 | 49.022843412109 | 1977 | 49.035280315777 | 1976 | 49.047510406186 | 1975 | 49.053803201277 | 1974 | 49.048758167603 | 1973 | 49.039592310527 | 1972 | 49.028483668497 | 1971 | 49.010881152178 | 1970 | 48.989033959623 | 1969 | 48.975540461503 | 1968 | 48.974702561569 | 1967 | 48.983693448114 | 1966 | 48.99900129308 | 1965 | 49.01032110806 | 1964 | 49.009835563845 | 1963 | 49.002897650522 | 1962 | 48.996226700037 | 1961 | 48.990241464511 | 1960 | 48.982881188389 |
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