Year	Percent
1990	3.28774
1991	3.17498
1992	2.55482
1993	2.49423
1994	1.98977
1995	1.72694
1996	1.68582
1997	1.49735
1998	1.38077
1999	1.34779
2000	1.33681
2001	1.29377
2002	1.27414
2003	1.25585
2005	1.13207
2006	1.09496
2007	1.06019
2008	1.0305
2009	1.00273
2010	1.03551
2011	1.01887
2012	1.00616
2013	0.98285
2014	0.97095
2015	0.95773
2016	0.95468
2017	0.94911
2018	0.94486
2019	0.93418
2020	0.95339