Year	Percent
1990	4.37154
1991	4.22007
1992	2.0529
1993	1.97483
1994	2.04957
1995	1.97268
1996	3.04558
1997	3.8129
1998	3.40269
1999	3.25664
2000	3.19814
2001	2.85529
2002	3.08272
2003	3.02568
2004	2.94694
2005	2.91732
2006	2.8348
2007	2.7507
2008	2.66851
2009	2.58725
2010	2.51125
2011	2.47017
2012	2.4291
2013	2.38684
2014	0.33997
2015	0.32499
2016	0.31233
2017	0.60131
2018	0.29008
2019	0.56036
2020	0.54827