Year	%
1992	15.09
1995	12.78
1997	12.66
1998	12.76
1999	12.66
2000	12.68
2001	12.71
2002	12.71
2003	12.7
2004	12.65
2005	12.64
2006	12.77
2007	13.58
2008	13.8
2009	13.8
2010	12.99
2011	13.8
2012	13.8
2013	13.8
2014	13.38
2015	12.49
2016	11.74
2017	10.46
2018	10.46
2019	10.46
2020	10.46
2021	10.46