Year | Value | 2022 | 38.603012160583 | 2021 | 38.091293872237 | 2020 | 37.648050311193 | 2019 | 37.99432170896 | 2018 | 37.273322054166 | 2017 | 36.569193111937 | 2016 | 35.943577521671 | 2015 | 35.357903178655 | 2014 | 34.76802286503 | 2013 | 34.215512342293 | 2012 | 33.694963417866 | 2011 | 33.228008942503 | 2010 | 32.706454696353 | 2009 | 32.269243445737 | 2008 | 31.98168272873 | 2007 | 31.680481553399 | 2006 | 31.329589944992 | 2005 | 31.816988895389 | 2004 | 32.203081833221 | 2003 | 32.539504325408 | 2002 | 32.869660684141 | 2001 | 33.092089497674 | 2000 | 33.232237729618 | 1999 | 33.171676722023 | 1998 | 33.303946552919 | 1997 | 33.363434452462 | 1996 | 33.458126313452 | 1995 | 33.526776251763 | 1994 | 33.679485413404 | 1993 | 33.765458901768 | 1992 | 33.889546586039 | 1991 | 33.962536715796 |
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