Year | Value | 2022 | 49.884974322407 | 2021 | 49.862742247411 | 2020 | 49.837469717001 | 2019 | 49.819108486217 | 2018 | 49.806829259532 | 2017 | 49.795696454241 | 2016 | 49.784754986618 | 2015 | 49.77840614428 | 2014 | 49.777613023217 | 2013 | 49.777122833418 | 2012 | 49.777451524678 | 2011 | 49.778987092337 | 2010 | 49.780015318937 | 2009 | 49.781228380913 | 2008 | 49.782822512645 | 2007 | 49.784736555882 | 2006 | 49.786520927909 | 2005 | 49.786558283009 | 2004 | 49.785894307658 | 2003 | 49.785449139265 | 2002 | 49.785723088395 | 2001 | 49.787193767495 | 2000 | 49.791526662758 | 1999 | 49.799213080145 | 1998 | 49.806118200139 | 1997 | 49.812357486721 | 1996 | 49.815984732745 | 1995 | 49.815061596076 | 1994 | 49.81406660305 | 1993 | 49.812754786542 | 1992 | 49.811887391855 | 1991 | 49.818073096965 | 1990 | 49.830208844938 | 1989 | 49.844697015879 | 1988 | 49.85860298791 | 1987 | 49.871205114028 | 1986 | 49.882682234794 | 1985 | 49.881226611407 | 1984 | 49.869615911041 | 1983 | 49.859538666459 | 1982 | 49.852164914217 | 1981 | 49.846792657146 | 1980 | 49.845160813781 | 1979 | 49.84674856765 | 1978 | 49.848230812164 | 1977 | 49.851062911198 | 1976 | 49.851666731969 | 1975 | 49.853800138785 | 1974 | 49.861986027387 | 1973 | 49.873669460015 | 1972 | 49.887913350903 | 1971 | 49.902989563132 | 1970 | 49.910394719251 | 1969 | 49.914315420651 | 1968 | 49.922897234971 | 1967 | 49.929443676369 | 1966 | 49.93470641227 | 1965 | 49.937755260632 | 1964 | 49.937238203246 | 1963 | 49.941680511086 | 1962 | 49.947049668713 | 1961 | 49.940009869699 | 1960 | 49.919045290885 |
|