Year	Percent
1983	3.19
1986	8.7
1987	9.78
1988	11.11
1989	9.9
1990	5.95
1991	8.05
1992	13.04
1995	10.75
1997	4.95
2003	7.14
2009	5.77
2010	6.03
2013	7.2
2014	6.25
2015	4.64
2016	3.34
2017	4.69
2018	4.46
2019	4.78