Year	Percent
1983	12.02
1984	11
1986	6.7
1988	4.39
1989	3.53
1990	4.23
1991	3.94
1992	3.27
1993	3.3
1994	4.59
1995	3.49
1996	5.29
1997	5.18
1998	5.48
1999	8.87
2000	8.23
2001	8.44
2002	8.14
2003	7.75
2004	8.33
2005	7.53
2006	7.36
2007	6.64
2008	7.27
2009	9.36
2010	7.39
2011	6.21
2012	5.71
2013	5.31
2014	5.75
2015	5.94
2016	6.29
2017	6.57
2018	6.89
2019	7.04
2020	10.83