Year | Value | 2021 | 24.546106843277 | 2020 | 24.716839420153 | 2019 | 24.886196951936 | 2018 | 25.057583232497 | 2017 | 25.225417011389 | 2016 | 25.394202147655 | 2015 | 25.566715655452 | 2014 | 25.73806333699 | 2013 | 25.908820968317 | 2012 | 26.080960313801 | 2011 | 26.411127163339 | 2010 | 26.584841769187 | 2009 | 26.724911478822 | 2008 | 26.864186641216 | 2007 | 27.003107644999 | 2006 | 27.142492379178 | 2005 | 27.281952448761 | 2004 | 27.421178911279 | 2003 | 27.758352475567 | 2002 | 27.898339212926 | 2001 | 28.038584036473 | 2000 | 28.178828860019 | 1999 | 28.335509770213 | 1998 | 28.491708043755 | 1997 | 28.647906317297 | 1996 | 28.804104595733 | 1995 | 28.960302869275 | 1994 | 29.116501142818 | 1993 | 29.262785740926 | 1992 | 29.418931115358 | 1991 | 29.985950760073 | 1990 | 30.142593199645 |
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