Year	Percent
1986	9.3
1987	8.67
1988	8.61
1989	6.55
1992	16.51
1995	12.37
1997	8.33
2003	7.42
2009	8.85
2010	9.39
2013	10.45
2014	10.63
2015	10.77
2016	7.8