Year	Percent
1983	5.41
1986	8.33
1987	13.51
1988	20.51
1989	6.82
1990	6.06
1991	8.11
1992	13.51
1995	10.26
1997	4.65
2003	11.29
2009	6.38
2010	5.66
2013	6.6
2014	5.98
2015	3.23
2016	3.31