Year | Value | 2022 | 26.580517314093 | 2021 | 26.306322296386 | 2020 | 26.067041749452 | 2019 | 26.305361694234 | 2018 | 26.130011362119 | 2017 | 25.91608467337 | 2016 | 25.638666927334 | 2015 | 25.439155966763 | 2014 | 25.272654710798 | 2013 | 25.081024071158 | 2012 | 24.911303101158 | 2011 | 24.559203900582 | 2010 | 24.184155264205 | 2009 | 23.791815937476 | 2008 | 23.370918019498 | 2007 | 22.840115629774 | 2006 | 22.436589512109 | 2005 | 22.131490702871 | 2004 | 21.878475881821 | 2003 | 21.611695372039 | 2002 | 21.608735189405 | 2001 | 21.663653170337 | 2000 | 21.409852028737 | 1999 | 21.270351548734 | 1998 | 21.031313115591 | 1997 | 20.887339133457 | 1996 | 20.701049274295 | 1995 | 20.55763102333 | 1994 | 20.534054153546 | 1993 | 20.515994525746 | 1992 | 20.520841613172 | 1991 | 20.576076527579 |
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