Year	Percent
1990	3.89079
1991	3.93655
1992	3.42093
1993	3.48975
1994	3.83872
1995	3.21856
1996	3.24733
1997	3.77043
1998	3.67264
1999	3.69083
2000	3.7525
2001	2.96039
2002	2.91348
2003	2.92842
2004	2.7731
2005	2.71531
2006	2.69582
2007	2.65875
2008	2.57884
2009	2.48156
2010	2.37566
2011	2.27123
2012	2.22551
2013	2.14439
2014	2.09535
2015	1.69446
2016	1.64238
2017	1.59168
2018	1.55806
2019	1.53989
2020	1.63258