Year	%
1991	6.57
1992	12.35
1994	12.35
1995	13.95
1996	12.02
1997	12.02
1998	12.06
1999	12.1
2000	12.11
2001	12.11
2002	12.14
2003	12.13
2004	12.14
2005	12.12
2006	12.13
2007	12.12
2008	12.08
2009	12.06
2010	12.06
2011	7.34
2012	5.27
2013	5.37
2014	4.87
2015	3.85
2016	3.9
2017	7.69
2018	4.99
2019	4.57
2020	4.55
2021	5.47