Year	Percent
1983	5.42
1984	5.87
1985	4.97
1986	6.15
1987	5.25
1988	6.25
1989	4.22
1990	3.56
1991	2.75
1992	2.82
1993	3.55
1994	4.92
1995	3.96
1996	4.48
1997	4.67
1998	5.32
1999	5.66
2000	3.22
2001	2.98
2002	3.48
2003	1.68
2004	3.63
2005	4.43
2006	4.76
2007	4.24
2008	4.36
2009	5.11
2010	4.63
2011	4.03
2012	4.49
2013	5.39
2014	5.37
2015	5.62
2016	5.66
2017	5.87
2018	4.35
2019	4.1
2020	4.17