Year	Percent
1997	0.13576
1998	0.10206
1999	0.17392
2000	11.06894
2001	8.5075
2002	5.85779
2003	5.56674
2004	4.48001
2005	5.36319
2006	6.21788
2007	8.94934
2008	4.78984
2009	6.21248
2010	8.612
2011	14.49102
2012	20.48283
2013	28.20829
2014	26.93152