Year	Percent
1990	2.12081
1991	1.84867
1992	1.64437
1993	2.84084
1994	1.54422
1995	1.609
1996	1.63941
1997	1.6535
1998	2.05818
1999	2.70102
2000	3.42707
2001	3.31357
2002	3.70876
2003	3.80532
2004	5.02315
2005	4.51072
2006	6.68085
2007	5.4168
2008	4.54379
2009	4.09791
2010	4.89423
2011	5.60284
2012	4.6913
2013	4.94142
2014	5.4878
2015	6.32742
2016	6.07239