Year | Value | 2021 | 22.907003011823 | 2020 | 23.031478701474 | 2019 | 23.15377206171 | 2018 | 23.279304814703 | 2017 | 23.402518422889 | 2016 | 23.528667832007 | 2015 | 23.659824472467 | 2014 | 23.786358119299 | 2013 | 23.91273983822 | 2012 | 24.038852711972 | 2011 | 24.312457073117 | 2010 | 24.439766037013 | 2009 | 24.548170173015 | 2008 | 24.652989946533 | 2007 | 24.761150859218 | 2006 | 24.869717747591 | 2005 | 24.978366214595 | 2004 | 25.086871866175 | 2003 | 25.380625392015 | 2002 | 25.489657891443 | 2001 | 25.598916604012 | 2000 | 25.708187943993 | 1999 | 25.828752087279 | 1998 | 25.949316235518 | 1997 | 26.069880383758 | 1996 | 26.190444531997 | 1995 | 26.311008675283 | 1994 | 26.431572823522 | 1993 | 26.552136971761 | 1992 | 26.672701120001 | 1991 | 27.110764042412 | 1990 | 27.233594486431 |
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