Year | Value | 2022 | 5.3 | 2021 | 5.9 | 2020 | 6.3 | 2019 | 7 | 2018 | 8.1 | 2017 | 9.5 | 2016 | 10.5 | 2015 | 11.7 | 2014 | 13.8 | 2013 | 15.8 | 2012 | 20.7 | 2011 | 23 | 2010 | 26.3 | 2009 | 29.3 | 2008 | 31.3 | 2007 | 33 | 2006 | 36 | 2005 | 38.3 | 2004 | 41.8 | 2003 | 44.8 | 2002 | 47.5 | 2001 | 51.2 | 2000 | 53.6 | 1999 | 56.2 | 1998 | 57.2 | 1997 | 57.4 | 1996 | 58.3 | 1995 | 60.1 | 1994 | 62.1 | 1993 | 64.3 | 1992 | 65.5 | 1991 | 66.5 | 1990 | 66.8 | 1989 | 67 | 1988 | 66 | 1987 | 67.5 | 1986 | 67.9 | 1985 | 69.9 | 1984 | 70.9 | 1983 | 71.7 | 1982 | 71.4 | 1981 | 71.5 |
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