Year | Value | 2020 | 104.66585845804 | 2019 | 105.43247529016 | 2018 | 103.86962841164 | 2017 | 102.85222335235 | 2016 | 102.54842069314 | 2015 | 102.40319634505 | 2014 | 103.27465575863 | 2013 | 102.45577757453 | 2012 | 102.50335106787 | 2011 | 101.13123136526 | 2010 | 100 | 2009 | 97.087975962304 | 2008 | 97.081895168804 | 2007 | 91.276764306864 | 2006 | 88.077591281808 | 2005 | 86.17957969358 | 2004 | 84.75409981185 | 2003 | 82.772436774365 | 2002 | 81.586682041741 | 2001 | 81.448175078671 | 2000 | 80.399846279162 | 1999 | 79.716716424426 | 1998 | 78.787436048785 | 1997 | 78.008020891085 | 1996 | 76.152714475029 | 1995 | 74.896575692165 | 1994 | 73.922617516635 | 1993 | 73.911429739251 | 1992 | 72.769654902972 | 1991 | 68.994401579313 | 1990 | 65.362184752462 | 1989 | 63.341021385515 | 1988 | 59.632746240814 | 1987 | 57.938287920995 | 1986 | 55.696728292098 | 1985 | 54.193280065969 | 1984 | 52.239532026207 | 1983 | 51.106003800528 | 1982 | 49.070579498985 | 1981 | 47.004904730116 | 1980 | 41.499319676685 | 1978 | 26.495087882719 | 1977 | 24.597951431812 | 1976 | 22.463132737624 | 1975 | 20.254848622787 | 1974 | 16.892725254208 | 1973 | 12.571229921845 | 1972 | 11.214388024929 | 1971 | 10.81551240603 | 1970 | 10.435915775404 | 1969 | 9.285159614919 | 1968 | 8.9095517404484 | 1967 | 8.4554983276369 | 1966 | 8.3757232038531 | 1964 | 7.9775123777122 |
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