Year	Percent
2000	0.53521
2001	0.45052
2002	0.39569
2003	0.58717
2004	0.64138
2005	0.67758
2006	0.5647
2007	0.5658
2008	0.43267
2009	0.63444
2010	1.14511
2011	1.49809
2012	2.72488
2013	4.04053
2014	4.4955
2015	3.73811
2016	3.0423
2017	2.34916