Year	Percent
1990	4.05193
1991	3.95649
1992	3.5098
1993	3.38605
1994	2.08367
1995	2.66181
1996	2.62104
1997	2.54536
1998	2.48896
1999	2.44763
2000	2.39101
2001	2.83554
2002	2.76746
2003	3.39487
2004	2.10086
2005	2.05222
2006	2.00363
2007	1.95483
2008	1.27052
2009	1.33219
2010	1.29675
2011	1.25914
2012	1.22357
2013	1.18871
2014	1.15491
2015	0.77415
2016	0.75186
2017	0.65634
2018	0.70905
2019	0.61904
2020	0.60663