Year	Percent
1993	4.58
1995	3.85
1996	3.49
1997	3.84
1998	4.72
1999	3.9
2000	12.33
2003	13.72
2004	12.92
2005	13.45
2006	11.03
2008	11.79
2009	9.69
2012	18.12
2014	9.71