Year	Percent
1985	4.29081
1986	4.67442
1987	4.54187
1988	4.28038
1989	4.27683
1990	4.02623
1991	4.42402
1992	4.72739
1993	2.75961
1994	2.44369
1995	2.28118
1996	2.09575
1997	2.02481
1998	1.73292
1999	1.78293
2000	1.67058
2001	1.79159
2002	1.6741
2003	1.74126
2004	1.89764
2005	1.60235
2006	1.41343
2007	1.46828
2008	1.15019
2009	1.02088
2010	0.73792
2011	0.8555
2012	0.93668
2013	1.04639
2014	2.29084
2015	1.32762
2016	1.55497
2017	1.56558