Year	Percent
1983	6.28
1984	6.57
1985	6.86
1986	7.39
1987	7.8
1988	7.66
1989	7.09
1990	6.52
1991	6.51
1992	7.48
1993	7.34
1994	6.68
1995	6.49
1996	8.12
1997	7.9
1998	8.32
1999	8.11
2000	7.35
2001	5.84
2002	5.3
2003	4.75
2004	5.64
2005	4.57
2006	4.96
2007	4.38
2008	4
2009	5.41
2010	5.77
2011	5.71
2012	6.2
2013	7.01
2014	7.45
2015	7.39
2016	7.21
2017	6.55
2018	6.77
2019	6.76
2020	5.77