Year | Value | 2022 | 23.1350203744 | 2021 | 26.071454826985 | 2020 | 27.420789052985 | 2019 | 20.049656058302 | 2018 | 19.501053800723 | 2017 | 22.11724159792 | 2016 | 24.584687548761 | 2015 | 23.977426828265 | 2014 | 21.768907172899 | 2013 | 21.531550936798 | 2012 | 23.710293175062 | 2011 | 25.440095829895 | 2010 | 23.189924184541 | 2009 | 25.804730399411 | 2008 | 24.514036545144 | 2007 | 25.899234041148 | 2006 | 26.653188260178 | 2005 | 21.109680586935 | 2004 | 18.14736868765 | 2003 | 16.877799640094 | 2002 | 19.069596338047 | 2001 | 20.693287653227 | 2000 | 27.047391060146 | 1999 | 22.81468993526 | 1998 | 21.609687173486 | 1997 | 23.706847676081 | 1996 | 29.911206532013 | 1995 | 32.278159437416 | 1994 | 31.96273814039 | 1993 | 36.356887346529 | 1992 | 35.390011861859 | 1991 | 60.480233037172 | 1990 | 62.320067648543 | 1989 | 47.72684570862 | 1988 | 47.742712179689 | 1987 | 50.504696522133 | 1986 | 48.84381131269 | 1985 | 44.071692035462 | 1984 | 46.76245345668 |
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