Year	Percent
1990	0.21
1991	0.62
1992	2.07
1993	3.49
1994	5.16
1995	6.24
1996	6.24
1997	5.55
1998	5.35
1999	6.09
2000	8.56
2001	9.23
2002	10.18
2003	7.4
2004	4.58
2005	5.43
2006	4.14
2007	3.56
2008	4.08
2009	9.34
2010	16.31
2011	11.6
2012	7.16
2013	6.05
2014	5.44
2015	6.04
2016	8.05
2017	5.73
2018	5.43
2019	4.05
2020	6.65