Year	Percent
1983	3.27
1984	4.33
1985	6.68
1986	7.67
1987	6.19
1988	5.27
1989	6.8
1990	4.21
1991	5.15
1992	4.79
1993	4.39
1994	3.44
1995	2.61
1996	3.32
1997	3.34
1998	2.96
1999	2.36
2000	1.88
2001	1.92
2002	2.81
2003	1.98
2004	2.31
2005	1.98
2006	2.09
2007	1.74
2008	2.02
2009	2.79
2010	2.45
2011	2.27
2012	2.34
2013	1.95
2014	1.97
2015	1.67
2016	1.48
2017	1.45
2018	1.33
2019	1.53