Year	Percent
1985	2.23
1986	1.93
1987	1.17
1988	0.87
1989	0.68
1990	0.89
1991	1.36
1992	1.52
1993	1.48
1994	1.45
1995	2.61
1996	2.24
1997	1.77
1998	3.69
2000	4.02
2001	4.25
2002	6.21
2003	6.88
2004	5.85
2005	4.8
2006	4
2007	3.36
2008	2.99
2009	4.48
2010	3.56
2011	2.89
2012	2.77
2013	2.8
2014	2.69
2015	2.65
2016	2.87
2017	2.67
2018	2.4
2019	2.49
2020	5.08