Year	%
1980	12.1
1985	12.2
1990	12.7
1993	11.9
1994	11.9
1995	11.9
1996	11.7
1997	11.9
1998	12.2
1999	12.3
2000	12.3
2003	13
2004	12.5
2005	12.8
2006	12.5
2007	12.2
2008	12.3
2009	12.2
2010	12
2011	11.8
2012	11.9
2013	11.7
2014	11.8
2015	11.7
2016	12
2017	12.2
2018	12.2
2019	12.3
2020	12.1
2021	12.3