Year	%
1991	3.57
1994	7.58
1995	11.51
1996	12.86
1997	14.68
1998	14.35
1999	12.57
2000	9.35
2001	8.22
2002	6.98
2003	6.19
2004	6.94
2005	5.34
2006	4.37
2007	5.25
2008	4.25
2009	5.22
2010	5.68
2011	5.27
2012	4.96
2013	5.08
2014	5.22
2015	5.71
2016	6.26
2017	11.67
2018	11.91
2019	11.91
2020	11.32
2021	9.95