Year | Value | 2022 | 49.725283885426 | 2021 | 49.703716768971 | 2020 | 49.674532660397 | 2019 | 49.649252923937 | 2018 | 49.632676478321 | 2017 | 49.620768746663 | 2016 | 49.612283805372 | 2015 | 49.611306128673 | 2014 | 49.614492406333 | 2013 | 49.617195166761 | 2012 | 49.622075277869 | 2011 | 49.62820319126 | 2010 | 49.632935163263 | 2009 | 49.641693083803 | 2008 | 49.658074250808 | 2007 | 49.677463776495 | 2006 | 49.695170099742 | 2005 | 49.705962474862 | 2004 | 49.709367712787 | 2003 | 49.710395605032 | 2002 | 49.712319659366 | 2001 | 49.715328722538 | 2000 | 49.723194255124 | 1999 | 49.734611274253 | 1998 | 49.742723008246 | 1997 | 49.750474986177 | 1996 | 49.758879130981 | 1995 | 49.765953904084 | 1994 | 49.772576060393 | 1993 | 49.78056235279 | 1992 | 49.790561362831 | 1991 | 49.804550758797 | 1990 | 49.819375820355 | 1989 | 49.835687382459 | 1988 | 49.853151850788 | 1987 | 49.869187799562 | 1986 | 49.884323636237 | 1985 | 49.896430253434 | 1984 | 49.904851879717 | 1983 | 49.910983324888 | 1982 | 49.918012243843 | 1981 | 49.924676499747 | 1980 | 49.930025091466 | 1979 | 49.932625470931 | 1978 | 49.935881197241 | 1977 | 49.942956432488 | 1976 | 49.949829760046 | 1975 | 49.955790736464 | 1974 | 49.962329353246 | 1973 | 49.971828144399 | 1972 | 49.983827126378 | 1971 | 49.99695240453 | 1970 | 50.004495766078 | 1969 | 50.010464081345 | 1968 | 50.022736975533 | 1967 | 50.032614706782 | 1966 | 50.040798805925 | 1965 | 50.051433213327 | 1964 | 50.058184403544 | 1963 | 50.066139832924 | 1962 | 50.075417900749 | 1961 | 50.070651934532 | 1960 | 50.049743947803 |
|