Year 2000 = 100 1980 85 1981 88 1982 91 1983 77 1984 79 1985 72 1986 76 1987 83 1988 92 1989 93 1990 96 1991 97 1992 100 1993 100 1994 101 1995 112 1996 109 1997 103 1998 102 1999 100 2000 100 2001 100.3650953 2002 100.8689933 2003 98.89155436 2004 92.42171284 2005 88.86708247 2006 86.27878248 2007 82.96029581 2008 74.73898059 2009 81.59282789 2010 76.97435821 2011 70.61866492 2012 69.91945201 2013 69.91942956 2014 70.91229719 2015 72.724953 2016 71.67552324 2017 73.29493557 2018 76.04919567