| Year | Value | | 2021 | 1.9180266156587 | | 2020 | 2.0104727339703 | | 2019 | 3.7970877241208 | | 2018 | 1.0268893080009 | | 2017 | 12.653224048511 | | 2016 | 5.0487465276666 | | 2015 | 1.4767539812782 | | 2014 | 10.029641373129 | | 2013 | 1.8418450275061 | | 2012 | 8.6419159755276 | | 2011 | 0.97278279734212 | | 2010 | -5.6303138082134 | | 2009 | 1.7946056723263 | | 2008 | 4.3483714804488 | | 2007 | -8.1258251851781 | | 2006 | 24.37886822056 | | 2005 | 9.840497214387 |
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