Year	%
1984	12.1
1987	12.6
1990	12.4
1993	12.2
1996	11.6
1998	12.5
1999	12.6
2000	13.2
2001	13
2002	12.3
2003	12.2
2004	12.1
2005	12
2006	11.8
2007	11.3
2008	11.4
2009	11.5
2010	10.9
2011	10.2
2012	10.2
2013	10.1
2014	10.2
2015	10.4
2016	10.4
2017	10.6
2018	10.7
2019	10.9
2020	10.9
2021	10.9
2022	11
2023	11