Year | Value | 2021 | 39.537211588524 | 2020 | 39.525022207004 | 2019 | 39.506948381983 | 2018 | 39.494572018903 | 2017 | 39.482423356649 | 2016 | 39.46329049741 | 2015 | 39.446085092944 | 2014 | 39.444105366303 | 2013 | 39.431635744084 | 2012 | 39.421198845498 | 2011 | 39.410710894142 | 2010 | 39.400112094266 | 2009 | 39.361981881242 | 2008 | 39.323788645386 | 2007 | 39.284179985678 | 2006 | 39.245925657269 | 2005 | 39.230368554884 | 2004 | 39.194368983377 | 2003 | 39.158620265896 | 2002 | 39.122453177043 | 2001 | 39.083940684562 | 2000 | 39.046101706347 | 1999 | 39.043297204707 | 1998 | 39.04667675796 | 1997 | 39.042471266307 | 1996 | 39.035097679189 | 1995 | 39.025771010534 | 1994 | 39.012005435028 | 1993 | 38.994912865016 | 1992 | 38.979834576792 |
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