Year | Value | 2022 | 49.731218110446 | 2021 | 49.732561625819 | 2020 | 49.727613406836 | 2019 | 49.725963624624 | 2018 | 49.729067748494 | 2017 | 49.728874138682 | 2016 | 49.724822015424 | 2015 | 49.722641267089 | 2014 | 49.725976688701 | 2013 | 49.733362039851 | 2012 | 49.742262453695 | 2011 | 49.751512559677 | 2010 | 49.762104784492 | 2009 | 49.778453131754 | 2008 | 49.804093575253 | 2007 | 49.829981899659 | 2006 | 49.854189832918 | 2005 | 49.877466516135 | 2004 | 49.894609177248 | 2003 | 49.909024080811 | 2002 | 49.922221110071 | 2001 | 49.934460426947 | 2000 | 49.943902233159 | 1999 | 49.953127009264 | 1998 | 49.967785113548 | 1997 | 49.981157056724 | 1996 | 49.993135179895 | 1995 | 50.004765968114 | 1994 | 50.010826437045 | 1993 | 50.010267953369 | 1992 | 50.005128656302 | 1991 | 49.997172831227 | 1990 | 49.98843001381 | 1989 | 49.981706130299 | 1988 | 49.98320504888 | 1987 | 49.985351460752 | 1986 | 49.980814781423 | 1985 | 49.9764442429 | 1984 | 49.976132295485 | 1983 | 49.977056490439 | 1982 | 49.975299928424 | 1981 | 49.976491365694 | 1980 | 49.979830441416 | 1979 | 49.985477789428 | 1978 | 49.994483709771 | 1977 | 50.002688457696 | 1976 | 50.01304187694 | 1975 | 50.03536561726 | 1974 | 50.048238667393 | 1973 | 50.046091584669 | 1972 | 50.047578773962 | 1971 | 50.098462439729 | 1970 | 50.148263334715 | 1969 | 50.145265956207 | 1968 | 50.139776465221 | 1967 | 50.133585445677 | 1966 | 50.128322331008 | 1965 | 50.123971386983 | 1964 | 50.12023090425 | 1963 | 50.117214510576 | 1962 | 50.114616101255 | 1961 | 50.112789728186 | 1960 | 50.110389588864 |
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