Year	Percent
1985	-0.00057
1986	0.00015
1987	0.02827
1988	0.03021
1989	0.06467
1990	2.78132
1991	3.9028
1992	4.80335
1993	7.02759
1994	11.93948
1995	8.58597
1996	9.71308
1997	8.2701
1998	6.14121
1999	4.92266
2000	4.16392
2001	3.97734
2002	3.99269
2003	3.66601
2004	3.54408
2005	3.3904
2006	3.616
2007	8.65472
2008	9.66304
2009	7.16882
2010	6.90061
2011	5.4818
2012	5.3703
2013	5.19793
2014	4.9408
2015	6.10636
2016	6.13807
2017	6.29847