Year	Percent
1990	5.02774
1991	4.70043
1992	3.78258
1993	2.74159
1994	3.56264
1995	4.59733
1996	4.28049
1997	4.33087
1998	4.35285
1999	4.16113
2000	3.87325
2001	5.70227
2002	3.59707
2003	3.17379
2004	3.22667
2005	3.2505
2006	0.71377
2007	0.7137
2008	0.72447
2009	0.91253
2010	0.93816
2011	0.9104
2012	0.90556
2013	0.89142
2014	0.88758
2015	0.89773
2016	0.98619
2017	0.98254
2018	0.98149
2019	0.97796
2020	0.99418