Year	Percent
1992	0.4
1993	1.2
1994	1.7
1995	2
1996	2.6
1997	2.7
1998	3.2
1999	3
2000	2.7
2001	2.3
2002	2.5
2003	2.4
2004	2
2005	2
2006	2.2
2007	2.5
2009	11.5
2016	6.9