Year	Percent
1990	4.16926
1991	4.01866
1992	2.83278
1993	2.73694
1994	3.31252
1995	3.56077
1996	3.67292
1997	3.54352
1998	3.34251
1999	3.13861
2000	3.08253
2001	2.90284
2002	2.76528
2003	2.61131
2004	2.43859
2005	2.1858
2006	1.72552
2007	1.35528
2008	1.12901
2009	0.98319
2010	0.92235
2011	0.88094
2012	0.83947
2013	0.78733
2014	0.71704
2015	0.64949
2016	1.09668
2017	1.07538
2018	1.03272
2019	1.0497
2020	1.07462