Year | Value | 2022 | 24.230945313308 | 2021 | 23.958818416721 | 2020 | 23.786613756829 | 2019 | 24.112640962253 | 2018 | 24.100075635112 | 2017 | 23.589098298234 | 2016 | 23.211252188331 | 2015 | 23.463208083142 | 2014 | 23.65431904021 | 2013 | 23.580317267649 | 2012 | 23.451541218072 | 2011 | 23.221938550573 | 2010 | 22.992946999724 | 2009 | 22.360175622957 | 2008 | 22.438411143335 | 2007 | 21.985599367586 | 2006 | 22.027253179253 | 2005 | 21.823357796009 | 2004 | 21.995542038682 | 2003 | 21.781733571617 | 2002 | 21.689412345304 | 2001 | 21.660173738659 | 2000 | 21.629533141045 | 1999 | 21.226888455573 | 1998 | 20.896205908999 | 1997 | 21.065513492053 | 1996 | 21.036650287357 | 1995 | 20.920095530859 | 1994 | 20.953972219544 | 1993 | 20.886469887651 | 1992 | 20.926018358374 | 1991 | 20.976860067988 |
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