Year | Value | 2022 | 3.789 | 2021 | 6.029 | 2020 | 5.478 | 2019 | 3.507 | 2018 | 2.704 | 2017 | 2.742 | 2016 | 2.978 | 2015 | 3.979 | 2014 | 4.897 | 2013 | 5.376 | 2012 | 6 | 2011 | 7.028 | 2010 | 7.564 | 2009 | 7.22 | 2008 | 2.946 | 2007 | 2.251 | 2006 | 2.83 | 2005 | 2.547 | 2004 | 4.031 | 2003 | 3.997 | 2002 | 2.988 | 2001 | 1.874 | 2000 | 1.936 | 1999 | 2.178 | 1998 | 3.069 | 1997 | 3.72 | 1996 | 3.6 | 1995 | 5.196 | 1994 | 5.326 | 1993 | 5.257 | 1992 | 4.305 | 1991 | 2.548 |
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