| Year | Value | | 2022 | 0.81044224019089 | | 2021 | 0.92936542632156 | | 2020 | 0.83871068068921 | | 2019 | 0.81851209652873 | | 2018 | 0.85254855710098 | | 2017 | 0.86418267991824 | | 2016 | 0.93390083225657 | | 2015 | 1.000613800555 | | 2014 | 1.0258268571615 | | 2013 | 1.0870557644686 | | 2012 | 1.1455719234288 | | 2011 | 1.1364302519237 | | 2010 | 1.2803414090517 | | 2009 | 1.376586211513 | | 2008 | 1.2206120604463 | | 2007 | 1.2361528958396 | | 2006 | 1.3865334685564 | | 2005 | 1.5442196576408 | | 2004 | 1.8896028081156 | | 2003 | 2.4166976904516 | | 2002 | 3.9043729051368 |
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