Year | Value | 2021 | 30.341073876165 | 2020 | 30.317733060527 | 2019 | 30.406626805189 | 2018 | 30.392721638426 | 2017 | 30.541113610519 | 2016 | 30.656339986099 | 2015 | 30.606277243256 | 2014 | 30.528301886793 | 2013 | 30.298411122145 | 2012 | 30.36826717364 | 2011 | 30.805618981436 | 2010 | 30.966633906146 | 2009 | 31.029792810412 | 2008 | 30.703556998342 | 2007 | 24.726911618669 | 2006 | 24.379344587885 | 2005 | 25.273088381331 | 2004 | 24.428997020854 | 2003 | 25.3227408143 | 2002 | 25.074478649454 | 2001 | 25.3227408143 | 2000 | 25.719960278054 | 1999 | 24.826216484608 | 1998 | 24.329692154916 | 1997 | 24.577954319762 | 1996 | 26.067527308838 | 1995 | 26.713008937438 | 1994 | 27.259185700099 | 1993 | 27.805362462761 | 1992 | 28.003972194638 |
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