Year	Percent
1984	0.69
1986	0.72
1987	0.75
1988	0.78
1989	2.43
1990	2.52
1991	2.55
1992	2.99
1993	2.63
1994	2.6
1995	3.01
1996	2.06
1997	1.45
1998	1.8
1999	0.91
2000	0.89
2001	1.21
2002	1.2
2003	1.05
2004	1.25
2005	1.53
2006	1.1
2007	0.94
2008	1.01
2009	1.09
2010	1.39
2011	1.22
2012	1.22
2013	1.25
2014	1.28
2015	1.63
2016	1.94
2017	1.79
2018	1.55
2019	1.58
2020	2.03