Year	Percent
1993	5.35
1994	3.17
1995	4.21
1996	4.2
1997	2.86
1998	6.38
1999	5.24
2000	2.45
2001	3.72
2002	3.69
2003	4.14
2004	2.35
2005	3.03
2006	2.36
2007	1.13
2008	0.83
2009	0.61
2010	1.32
2011	1.39
2012	2.81
2013	1.49
2014	1.25
2015	1.02
2016	0.76
2017	0.8
2018	0.79
2019	0.42