Year	Percent
1996	0.59888
1997	3.09685
1998	2.16698
1999	0.60196
2001	1.52314
2002	83.64026
2003	27.00414
2004	19.88993
2005	25.34354
2006	16.28882
2007	16.33284
2008	6.7139
2009	11.63874
2010	5.36846
2011	6.16039
2012	2.46893
2013	6.51641
2014	11.89914
2015	12.98356
2016	12.28155