Year | Value | 2021 | 12.890335424602 | 2020 | 12.86688326238 | 2019 | 12.843580551199 | 2018 | 12.820053775487 | 2017 | 12.797647322429 | 2016 | 12.77120770782 | 2015 | 12.737373963702 | 2014 | 12.732838897602 | 2013 | 12.728303831503 | 2012 | 12.723768765404 | 2011 | 12.719233699305 | 2010 | 12.714698633206 | 2009 | 12.677049070132 | 2008 | 12.639399507058 | 2007 | 12.601749943984 | 2006 | 12.56410038091 | 2005 | 12.526450817835 | 2004 | 12.488801254761 | 2003 | 12.451151691687 | 2002 | 12.413502128613 | 2001 | 12.375852565539 | 2000 | 12.338203002465 | 1999 | 12.33344163119 | 1998 | 12.328680259915 | 1997 | 12.32391888864 | 1996 | 12.319157517365 | 1995 | 12.31439614609 | 1994 | 12.309634774815 | 1993 | 12.30487340354 | 1992 | 12.300112032265 | 1991 | 12.29535066099 | 1990 | 12.290589289715 |
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