| Year | Value | | 2021 | 10.400763952074 | | 2020 | 10.440714878192 | | 2019 | 10.480178609927 | | 2018 | 10.520373151508 | | 2017 | 10.559836883242 | | 2016 | 10.600396829747 | | 2015 | 10.632187058088 | | 2014 | 10.713818517991 | | 2013 | 10.795449977893 | | 2012 | 10.877081437795 | | 2011 | 10.958712897698 | | 2010 | 11.0403443576 | | 2009 | 11.155958475384 | | 2008 | 11.271572593169 | | 2007 | 11.387186710954 | | 2006 | 11.502800828738 | | 2005 | 11.618414946523 | | 2004 | 11.734029064308 | | 2003 | 11.849643182092 | | 2002 | 11.965257299877 | | 2001 | 12.080871417662 | | 2000 | 12.196485535446 | | 1999 | 12.263208474471 | | 1998 | 12.329931413496 | | 1997 | 12.396654352521 | | 1996 | 12.463377291546 | | 1995 | 12.530100230571 | | 1994 | 12.596823169595 | | 1993 | 12.66354610862 | | 1992 | 12.730269047645 | | 1991 | 12.79699198667 | | 1990 | 12.863714925695 |
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