Years
Numerical value | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 |
ESI | 56.4 | 56.6 | 55.6 | 55.2 | 53.9 | 55.0 | 59.2 | 53.4 | 55.5 | 55.5 | 52.0 | 56.4 | 59.0 | 60.9 |