Year | Value | 2019 | 87.3 | 2018 | 87.3 | 2017 | 87.4 | 2016 | 87.5 | 2015 | 87.5 | 2014 | 87.7 | 2013 | 88.1 | 2012 | 88.4 | 2011 | 88.7 | 2010 | 88.9 | 2009 | 89.4 | 2008 | 89.5 | 2007 | 90 | 2006 | 90.3 | 2005 | 91 | 2004 | 91.3 | 2003 | 91.7 | 2002 | 91.6 | 2001 | 91.6 | 2000 | 91.6 | 1999 | 91.5 | 1998 | 91.3 | 1997 | 91.1 | 1996 | 91.2 | 1995 | 91.4 | 1994 | 91.6 | 1993 | 91.5 | 1992 | 90.8 | 1991 | 90.4 | 1990 | 90.2 |
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