Year	Percent
1989	0.21347
1990	1.59149
1991	2.81358
1992	1.05929
1993	1.55356
1994	7.87647
1995	4.33265
1997	5.69624
1998	1.96421
1999	5.71286
2000	5.76547
2001	7.04655
2002	3.2997
2003	1.78207
2004	1.90432
2005	1.59605
2006	1.2307
2007	1.12756
2008	0.91678
2009	1.41337
2010	2.86199
2011	2.51303
2012	2.25436
2013	1.59561
2014	1.55239
2015	1.81774
2016	1.91919