Year	%
1996	11.3
1997	10.4
1998	10.5
1999	10.6
2000	10.6
2001	10.9
2002	11.3
2003	11.4
2004	11.5
2005	11.2
2006	11.4
2007	11.1
2008	10.9
2009	11
2010	10.7
2011	10.8
2012	10.8
2013	10.8
2014	11.2
2015	11.3
2016	11.5
2017	11.1
2018	11.5
2019	11.7
2020	12
2021	12.1