Year | Value | 2022 | 9.085 | 2021 | 9.282 | 2020 | 9.687 | 2019 | 10.74 | 2018 | 12.195 | 2017 | 12.232 | 2016 | 12.618 | 2015 | 11.166 | 2014 | 10.68 | 2013 | 10.595 | 2012 | 12.275 | 2011 | 12.491 | 2010 | 13.679 | 2009 | 12.113 | 2008 | 10.63 | 2007 | 10.772 | 2006 | 11.519 | 2005 | 11.813 | 2004 | 10.3 | 2002 | 12.8 | 1996 | 9.1 | 1991 | 11.1 | 1986 | 14.2 |
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