Year | Value | 2022 | 21.536120245067 | 2021 | 21.121052283765 | 2020 | 20.7977012045 | 2019 | 21.132753211317 | 2018 | 20.596401667541 | 2017 | 20.102777267694 | 2016 | 19.714343794543 | 2015 | 19.407676326412 | 2014 | 19.0253952374 | 2013 | 18.646704587672 | 2012 | 18.294098179952 | 2011 | 17.940150664633 | 2010 | 17.600421392812 | 2009 | 17.246407396291 | 2008 | 16.934890852557 | 2007 | 16.646796158699 | 2006 | 16.427110813693 | 2005 | 16.198177565238 | 2004 | 15.981257498022 | 2003 | 15.725713478965 | 2002 | 15.506501934861 | 2001 | 15.300080677374 | 2000 | 15.060862640273 | 1999 | 14.846456070933 | 1998 | 14.67712042998 | 1997 | 14.545727506977 | 1996 | 14.415532843763 | 1995 | 14.303375092532 | 1994 | 14.213400553268 | 1993 | 14.12305888491 | 1992 | 14.067269482376 | 1991 | 14.002141572689 |
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