Years Numerical value | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 |
CI | 0.57 | 0.60 | 0.63 | 0.63 | 0.64 | 0.69 | 0.70 | 0.70 | 0.70 | 0.71 | 0.68 | 0.70 | 0.60 | 0.61 |