Year | Value | 2022 | 50.425290609882 | 2021 | 50.437192300435 | 2020 | 50.454317191824 | 2019 | 50.480980414578 | 2018 | 50.518120679174 | 2017 | 50.55616092177 | 2016 | 50.594837526355 | 2015 | 50.636581166772 | 2014 | 50.679455604022 | 2013 | 50.721563771374 | 2012 | 50.765981968995 | 2011 | 50.813437466162 | 2010 | 50.861888041241 | 2009 | 50.911254052349 | 2008 | 50.963044291243 | 2007 | 50.993990327383 | 2006 | 51.003891722815 | 2005 | 51.016107312125 | 2004 | 51.029755747528 | 2003 | 51.041893765437 | 2002 | 51.054324064766 | 2001 | 51.068480515146 | 2000 | 51.081952298799 | 1999 | 51.089769884581 | 1998 | 51.095263204237 | 1997 | 51.101895740686 | 1996 | 51.109035028418 | 1995 | 51.115084592351 | 1994 | 51.116718183651 | 1993 | 51.113772662593 | 1992 | 51.110230911572 | 1991 | 51.110817310229 | 1990 | 51.120877042162 | 1989 | 51.140514860994 | 1988 | 51.163528388582 | 1987 | 51.191009003885 | 1986 | 51.212308218939 | 1985 | 51.22068726188 | 1984 | 51.226127878537 | 1983 | 51.232094969714 | 1982 | 51.236498290474 | 1981 | 51.250843438919 | 1980 | 51.279922075262 | 1979 | 51.252730779426 | 1978 | 51.204333717533 | 1977 | 51.218005094645 | 1976 | 51.259638945279 | 1975 | 51.303050242946 | 1974 | 51.340794125115 | 1973 | 51.388420917638 | 1972 | 51.448063305196 | 1971 | 51.505279004682 | 1970 | 51.546471190428 | 1969 | 51.57397400726 | 1968 | 51.602466683031 | 1967 | 51.632144914259 | 1966 | 51.663288644266 | 1965 | 51.694909587947 | 1964 | 51.728675185161 | 1963 | 51.761739621165 | 1962 | 51.792643227133 | 1961 | 51.826663235105 | 1960 | 51.860939972635 |
|