Year	Percent
1982	5.97
1983	6.77
1984	6.62
1985	5.95
1986	5.73
1987	3.85
1988	3.39
1989	2.76
1990	3.42
1991	4.2
1992	4.33
1993	4.49
1994	4.34
1995	6.87
1996	6.65
1997	5.21
1998	10.54
2000	11.19
2001	11.27
2002	14.95
2003	14.97
2004	12.14
2005	10.72
2006	10.4
2007	8.99
2008	8.54
2009	12.55
2010	12.16
2011	9.31
2012	9.27
2013	9.49
2014	9.25
2015	10.48
2016	9.76
2017	8.55
2018	8.74
2019	8.51
2020	15.46