Year	Percent
1985	5.9459
1986	5.03676
1987	4.66959
1988	4.48975
1989	3.96114
1990	3.82793
1991	3.60051
1992	2.68907
1993	2.41242
1994	2.24086
1995	2.26015
1996	2.62634
1997	2.96726
1998	1.86244
1999	2.27364
2000	2.92801
2001	4.00238
2002	2.73939
2003	3.99527
2004	3.83813
2005	3.05156
2006	2.69365
2008	3.49644
2009	3.98552
2012	3.73909
2013	3.51491
2014	3.61557
2015	3.76788
2016	4.0574