Year | Value | 2022 | 49.28010724015 | 2021 | 49.256543950198 | 2020 | 49.231348897279 | 2019 | 49.211159070282 | 2018 | 49.195341766926 | 2017 | 49.180516551109 | 2016 | 49.169253167849 | 2015 | 49.16181908307 | 2014 | 49.156635002086 | 2013 | 49.153276934773 | 2012 | 49.15173190761 | 2011 | 49.15177686354 | 2010 | 49.151862729564 | 2009 | 49.152510059577 | 2008 | 49.155320088794 | 2007 | 49.159759290597 | 2006 | 49.165132405087 | 2005 | 49.171425571948 | 2004 | 49.178095226094 | 2003 | 49.184544587094 | 2002 | 49.19109611518 | 2001 | 49.198346654554 | 2000 | 49.208973733 | 1999 | 49.220994677104 | 1998 | 49.229349154792 | 1997 | 49.237849483148 | 1996 | 49.248571213137 | 1995 | 49.25981979745 | 1994 | 49.271370722725 | 1993 | 49.283000811932 | 1992 | 49.29599917759 | 1991 | 49.311330626768 | 1990 | 49.326637245834 | 1989 | 49.340638859522 | 1988 | 49.352062586851 | 1987 | 49.361429582314 | 1986 | 49.369148221979 | 1985 | 49.373799646116 | 1984 | 49.375823169507 | 1983 | 49.375341470211 | 1982 | 49.374376254093 | 1981 | 49.373106752446 | 1980 | 49.369365062514 | 1979 | 49.360159781121 | 1978 | 49.349036049191 | 1977 | 49.340419647814 | 1976 | 49.33131517548 | 1975 | 49.32021971493 | 1974 | 49.312774186141 | 1973 | 49.312195384976 | 1972 | 49.313408034862 | 1971 | 49.315555417432 | 1970 | 49.316745338222 | 1969 | 49.313249149962 | 1968 | 49.306194415603 | 1967 | 49.296628590283 | 1966 | 49.284472632296 | 1965 | 49.26593336475 | 1964 | 49.245088981864 | 1963 | 49.228492955234 | 1962 | 49.210395696181 | 1961 | 49.183662443164 | 1960 | 49.148119475134 |
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