Year	Percent
1976	2.94
1978	1.79
1979	2.08
1980	1.82
1982	4.12
1984	8.91
1987	9.63
1988	5.28
1989	2.43
1990	4.28
1994	2.61
1996	2.46
1997	2.17
1998	7.44
1999	7.74
2000	6.56
2001	7.58
2003	5.03
2004	4.5
2005	4.76
2006	4.77
2007	4.47
2008	4.77
2009	5.6
2010	2.53
2011	2.88
2012	2.7
2013	1.21
2014	3.14
2015	3.1
2016	3.71
2017	4.36
2018	4
2019	4.16
2020	5.16