Year	Percent
1995	1.47806
1996	1.40048
1997	4.07964
1998	4.60507
1999	3.23629
2000	9.89888
2001	6.98609
2002	5.05771
2003	3.72305
2004	5.81203
2005	6.38147
2006	7.58977
2007	12.17908
2008	12.00055
2009	4.74664
2010	4.92325
2011	4.95965
2012	3.44243
2013	3.02905
2014	4.28208
2015	3.31864
2016	1.33863
2017	2.56456