Year	%
1991	8.97
1992	12.13
1994	12.37
1995	12.71
1996	12.52
1997	12.52
1998	12.64
1999	12.64
2000	12.64
2001	12.64
2002	12.69
2003	12.68
2004	13.47
2005	13.54
2006	13.67
2007	13.66
2008	13.85
2009	13.77
2010	13.96
2011	11.69
2012	10.36
2013	10.7
2014	10.56
2015	10.53
2016	9.88
2017	11.98
2018	10.25
2019	10.17
2020	10.17
2021	10.17