Year | Value | 2021 | 39.317684732671 | 2020 | 39.305126635855 | 2019 | 39.286946248133 | 2018 | 39.274155874813 | 2017 | 39.261654451644 | 2016 | 39.242166675229 | 2015 | 39.223437806062 | 2014 | 39.217294593865 | 2013 | 39.201041031286 | 2012 | 39.186705238979 | 2011 | 39.17204732328 | 2010 | 39.157674117276 | 2009 | 39.118534835517 | 2008 | 39.079589607515 | 2007 | 39.039018783538 | 2006 | 38.999623521857 | 2005 | 38.981421649054 | 2004 | 38.944335076802 | 2003 | 38.907763333684 | 2002 | 38.870687693329 | 2001 | 38.831474136639 | 2000 | 38.792640837656 | 1999 | 38.789157837108 | 1998 | 38.791486483728 | 1997 | 38.786440253605 | 1996 | 38.778361907198 | 1995 | 38.768546013054 | 1994 | 38.754231227381 | 1993 | 38.736815615481 | 1992 | 38.721264737692 |
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