Year | Value | 2022 | 0.8 | 2021 | 0.8 | 2020 | 0.9 | 2019 | 0.5 | 2018 | 0.4 | 2017 | 0.5 | 2016 | 0.7 | 2015 | 0.8 | 2014 | 0.8 | 2013 | 1.1 | 2012 | 1.3 | 2011 | 1.3 | 2010 | 1.6 | 2009 | 2.2 | 2008 | 2.2 | 2007 | 3.6 | 2006 | 4.5 | 2005 | 5.8 | 2004 | 6.5 | 2003 | 5.1 | 2002 | 3.9 | 2001 | 2.8 | 2000 | 2.4 | 1998 | 2.4 | 1997 | 2.5 | 1996 | 2.7 | 1995 | 2.4 | 1992 | 2.6 | 1989 | 3.3 | 1981 | 4.2 |
|