Year	Percent
1982	1.97
1983	2.38
1984	2.66
1985	3.06
1986	2.74
1987	2.86
1988	3.01
1989	2.52
1990	4.71
1991	4.97
1992	5.8
1993	7.28
1994	3.42
1995	3.89
1996	4.6
1997	5.16
1998	6.36
1999	4.75
2000	6.74
2001	5.55
2002	5.75
2003	6.07
2004	5.07
2005	3.97
2006	4.02
2007	3.45
2008	2.25
2009	2.72
2010	2.47
2011	3.59
2012	3.44
2013	3.78
2014	3.82
2015	4.72
2016	4.97
2017	4.24
2018	3.85
2019	3.39
2020	4.03