Year	Percent
1984	0.6001
1985	0.7003
1986	0.8982
1987	1.3393
1988	0.7974
1990	0.6295
1991	1.2294
1992	1.316
1993	0.7814
1994	1.5514
1995	1.1161
1996	1.7734
1997	1.8387
1998	0.8677
1999	1.1872
2000	0.8471
2001	0.5623
2002	0.4113
2003	0.8074
2004	0.7971
2005	0.7344
2006	0.5805
2007	1.0558
2008	0.9281
2009	1.0555
2010	0.579
2011	0.9148
2012	0.7155
2013	0.7527
2014	0.7908
2015	0.8323
2016	0.6281
2017	0.7233