| Year | Value | | 2021 | 0.89235491444513 | | 2020 | 0.99960365286758 | | 2019 | 0.97285630796804 | | 2018 | 0.86370732355353 | | 2017 | 1.1394471240359 | | 2016 | 1.2014464828401 | | 2015 | 1.2445787317652 | | 2014 | 1.2201987554936 | | 2013 | 1.337735111972 | | 2012 | 1.3828294171902 | | 2011 | 1.7402311927918 | | 2010 | 1.7335078115831 | | 2009 | 1.5605851045758 | | 2008 | 3.1727705614886 | | 2007 | 3.2291750262615 | | 2006 | 3.8367704286933 | | 2005 | 3.5103056881648 | | 2004 | 2.711377254597 | | 2003 | 1.7316421844561 | | 2002 | 2.0168291024721 | | 1995 | 2.3255813953488 |
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