| Year | Value | | 2022 | 7.5310783463429 | | 2021 | 2.0629963854533 | | 2020 | 0.62598970704672 | | 2019 | 1.4313559818298 | | 2018 | 1.2071579336701 | | 2017 | 2.4324878904136 | | 2016 | 0.4894377962305 | | 2015 | 0.96899345882564 | | 2014 | 1.0894415743535 | | 2013 | 1.0594978235617 | | 2012 | 3.3768804433887 | | 2011 | 3.4567496723461 | | 2010 | 3.3700254022015 | | 2009 | 0.55015999550891 | | 2008 | 5.3338063982023 | | 2007 | 1.4160525940974 | | 2006 | 1.7877853741912 | | 2005 | 2.0987519670931 | | 2004 | 2.0300775785324 | | 2003 | 1.9935305515245 | | 2002 | 2.4076580129349 | | 2001 | 1.4027966357399 | | 2000 | 0.77177979690018 | | 1999 | 1.1212878957115 |
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