Year	Percent
1990	6.79481
1991	6.33205
1992	4.93109
1993	4.61059
1994	4.72802
1995	5.26961
1996	4.56077
1997	4.26678
1998	3.98223
1999	3.71424
2000	3.49247
2001	3.26174
2002	1.9186
2003	2.18836
2004	2.03459
2005	1.9091
2006	1.64669
2007	1.3531
2008	1.11901
2009	0.96246
2010	0.89708
2011	0.88192
2012	0.86749
2013	1.05463
2014	1.03851
2015	1.02342
2016	1.00894
2017	0.99549
2018	0.98361
2019	0.9723
2020	0.97049