Year | Value | 2021 | 26.934756968356 | 2020 | 27.107788640083 | 2019 | 27.278722731594 | 2018 | 27.452787555131 | 2017 | 27.624121047793 | 2016 | 27.796600855863 | 2015 | 27.974251043375 | 2014 | 28.138905267802 | 2013 | 28.30341371061 | 2012 | 28.467934631905 | 2011 | 28.261291343987 | 2010 | 28.422070936825 | 2009 | 28.562091707578 | 2008 | 28.701176980832 | 2007 | 28.840161023254 | 2006 | 28.979267124737 | 2005 | 29.118294497402 | 2004 | 29.25739968981 | 2003 | 29.617553477815 | 2002 | 29.757638408903 | 2001 | 29.897723339991 | 2000 | 30.037808271079 | 1999 | 30.193588600444 | 1998 | 30.34936892981 | 1997 | 30.505149259175 | 1996 | 30.660929588541 | 1995 | 30.816709917906 | 1994 | 30.972490247272 | 1993 | 31.128270576638 | 1992 | 31.284050906003 | 1991 | 31.439831235369 | 1990 | 31.595611564734 |
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