Year | Value | 2022 | 36.534284688255 | 2021 | 35.786453538137 | 2020 | 32.169314003035 | 2019 | 29.080134623085 | 2018 | 28.259798413935 | 2017 | 27.351238840529 | 2016 | 25.982374021738 | 2015 | 25.076378850203 | 2014 | 24.083476164054 | 2013 | 24.478670232767 | 2012 | 24.628026822766 | 2011 | 24.973245250705 | 2010 | 24.832337216438 | 2009 | 25.033251148184 | 2008 | 26.317699622959 | 2007 | 27.03179386339 | 2006 | 27.957419913565 | 2005 | 27.092997925288 | 2004 | 27.34190482798 | 2003 | 28.226246226453 | 2002 | 29.623504187254 | 2001 | 30.061626483831 | 2000 | 29.80291817167 | 1999 | 29.98446227253 | 1998 | 29.932929105488 | 1997 | 29.988057811317 | 1996 | 30.100067424552 | 1995 | 30.00598003465 | 1994 | 30.043723385765 | 1993 | 30.061868086241 | 1992 | 30.135896689693 | 1991 | 30.290444865648 |
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