Year | Value | 2022 | 48.211487314424 | 2021 | 47.8562609676 | 2020 | 48.685552677414 | 2019 | 50.832125223138 | 2018 | 50.376541279207 | 2017 | 49.409267348618 | 2016 | 48.308228633655 | 2015 | 48.502592353661 | 2014 | 48.770083528665 | 2013 | 49.621471770487 | 2012 | 50.610952039578 | 2011 | 50.467409295112 | 2010 | 50.168969133226 | 2009 | 51.499634718858 | 2008 | 48.644317724172 | 2007 | 48.818283708982 | 2006 | 51.395048638561 | 2005 | 54.918482509123 | 2004 | 56.452838084063 | 2003 | 57.972282836574 | 2002 | 57.537894983722 | 2001 | 56.152015614478 | 2000 | 54.563409326892 | 1999 | 56.361119477798 | 1998 | 58.850192526421 | 1997 | 58.307657812661 | 1996 | 60.017681441483 | 1995 | 60.138459146894 | 1994 | 59.511341605485 | 1993 | 60.278134128761 | 1992 | 62.150854362316 | 1991 | 63.20363306377 | 1990 | 63.728023705379 | 1989 | 63.543539898825 | 1988 | 66.588682603621 | 1987 | 68.878008620964 | 1986 | 67.207077395029 | 1985 | 70.659567968761 | 1984 | 69.581234472361 | 1983 | 71.388604932368 | 1982 | 72.706108908749 | 1981 | 74.272207428569 | 1980 | 71.550134436908 | 1979 | 69.965556396008 | 1978 | 69.69966045599 | 1977 | 71.435025181091 | 1976 | 67.505460307926 | 1975 | 68.781156245928 | 1974 | 54.407179940926 | 1973 | 56.743251078059 | 1972 | 61.533093455142 | 1971 | 62.63683468533 | 1970 | 57.389490531871 |
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