Year	Percent
1983	9.08
1984	7.27
1986	4.61
1988	3.42
1989	3.01
1990	2.02
1991	2.08
1992	1.69
1993	2.15
1994	2.94
1995	2.57
1996	4.09
1997	4.09
1998	4.54
1999	7.47
2000	7.02
2001	6
2002	5.67
2003	5.74
2004	5.45
2005	4.97
2006	4.64
2007	4.73
2008	4.6
2009	6.68
2010	4.46
2011	4.06
2012	3.57
2013	3.09
2014	3.85
2015	3.23
2016	4.12
2017	4.2
2018	4.41
2019	4.06
2020	7.43