Year	Percent
1990	2.36
1991	3.08
1992	1.33
1993	1.93
1994	1.11
1995	2.44
1996	2.12
1997	3.58
1998	2.03
1999	1.37
2000	2.79
2001	2.69
2002	2.03
2003	3.99
2004	4.46
2005	3.16
2006	2.75
2007	2.04
2008	2.53
2009	2.65
2010	3.45
2011	5.91
2012	5.34
2013	3.71
2014	3.69
2015	4.36
2016	4.12
2017	3.54
2018	3.7
2019	5.7
2020	8.88