Year	Percent
1996	24.65791
1997	10.16998
1998	7.89323
1999	7.44564
2000	3.76053
2001	6.32597
2002	5.04795
2003	4.29339
2004	4.86741
2005	6.0717
2006	8.87791
2007	11.51046
2008	7.49281
2009	0.43069
2010	1.73588
2011	5.2609
2012	3.15975
2013	3.55574
2014	1.47205
2015	1.24619
2016	1.59269
2017	3.97728