Year	Percent
1990	0.97136
1991	0.94455
1992	0.92081
1993	0.8935
1994	0.86632
1995	1.48201
1996	1.78439
1997	1.73009
1998	1.68692
1999	1.64842
2000	1.61436
2001	1.50883
2002	1.48016
2003	1.47325
2004	0.98092
2005	1.01576
2006	1.08476
2007	1.0362
2008	1.0094
2009	0.96472
2010	0.97148
2011	0.94827
2012	0.88426
2013	0.8832
2014	0.88964
2015	0.8727
2016	0.83138
2017	0.86337
2018	0.88871
2019	0.86926
2020	0.88266