Year	Percent
1984	11.59083
1985	9.20561
1986	10.63728
1987	11.53753
1988	13.54737
1989	20.21478
1990	8.5956
1991	6.17574
1992	4.77756
1993	8.3146
1994	4.94721
1995	7.60179
1996	8.05869
1997	6.33773
1998	6.30705
1999	9.46837
2000	7.95308
2001	8.98655
2002	19.69755
2003	22.05765
2004	22.9247
2005	17.77675
2006	16.66816
2007	16.08065
2008	14.30718
2009	15.40204
2010	13.07656
2011	12.83908
2012	9.15078
2013	11.04587
2014	11.30538
2015	11.32567
2016	12.8684