Year | Value | 2022 | 50.117055556601 | 2021 | 50.155727005286 | 2020 | 50.202694970125 | 2019 | 50.235516329486 | 2018 | 50.252164552049 | 2017 | 50.269051735499 | 2016 | 50.28598470303 | 2015 | 50.302671259959 | 2014 | 50.319470014941 | 2013 | 50.336994544252 | 2012 | 50.354906105634 | 2011 | 50.372124707322 | 2010 | 50.388701462448 | 2009 | 50.404837495425 | 2008 | 50.420111424486 | 2007 | 50.434315104943 | 2006 | 50.447940999279 | 2005 | 50.461653074395 | 2004 | 50.475121250127 | 2003 | 50.489645016472 | 2002 | 50.504624247648 | 2001 | 50.517683113951 | 2000 | 50.506455745464 | 1999 | 50.469152222311 | 1998 | 50.425199784528 | 1997 | 50.37310053469 | 1996 | 50.314298992649 | 1995 | 50.248939261524 | 1994 | 50.176364573609 | 1993 | 50.096686468759 | 1992 | 50.045960338466 | 1991 | 50.029531155127 | 1990 | 50.013302905755 | 1989 | 49.99626572443 | 1988 | 49.97786619542 | 1987 | 49.957456607691 | 1986 | 49.935088760581 | 1985 | 49.911238202026 | 1984 | 49.886291040553 | 1983 | 49.860569680849 | 1982 | 49.834237950246 | 1981 | 49.806276319762 | 1980 | 49.777339538724 | 1979 | 49.747984984974 | 1978 | 49.718581324693 | 1977 | 49.690403486855 | 1976 | 49.663628797059 | 1975 | 49.63795220384 | 1974 | 49.611379871215 | 1973 | 49.584272358314 | 1972 | 49.558972373505 | 1971 | 49.534358857975 | 1970 | 49.509703331645 | 1969 | 49.485722335981 | 1968 | 49.463746531582 | 1967 | 49.442863764761 | 1966 | 49.422594560265 | 1965 | 49.4033669209 | 1964 | 49.384782919449 | 1963 | 49.368747828348 | 1962 | 49.353905396802 | 1961 | 49.338924904828 | 1960 | 49.326624437123 |
|