Year | Value | 2021 | 15.7345 | 2020 | 15.711 | 2019 | 15.6875 | 2018 | 15.664 | 2017 | 15.64 | 2016 | 15.6165 | 2015 | 15.617 | 2014 | 15.42605 | 2013 | 15.2351 | 2012 | 15.04415 | 2011 | 14.8532 | 2010 | 14.66225 | 2009 | 14.625025 | 2008 | 14.5878 | 2007 | 14.550575 | 2006 | 14.51335 | 2005 | 14.476125 | 2004 | 14.4389 | 2003 | 14.401675 | 2002 | 14.36445 | 2001 | 14.327225 | 2000 | 14.29 | 1999 | 14.1896 | 1998 | 14.0892 | 1997 | 13.9888 | 1996 | 13.8884 | 1995 | 13.788 | 1994 | 13.6876 | 1993 | 13.5872 | 1992 | 13.4868 | 1991 | 13.3864 | 1990 | 13.286 |
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