Year	Percent
1984	2.7924
1985	2.46344
1986	2.33553
1987	2.10368
1988	1.91389
1992	0.99259
1993	0.75658
1994	0.83888
1995	1.26508
1996	0.84418
1997	0.83101
1998	0.85854
1999	0.83854
2000	1.26126
2001	0.82387
2002	0.72803
2003	0.71045
2004	0.69804
2005	0.72866
2006	0.63049
2007	0.5247
2008	0.60127
2009	0.49088
2010	0.49506
2011	0.52324
2012	0.55577
2013	0.5303
2014	0.54081
2015	0.56675
2016	0.62905
2017	0.54208