Year	Percent
1990	0.44171
1991	0.4082
1992	0.39891
1993	0.40567
1994	0.55528
1995	0.59347
1996	0.68691
1997	0.73285
1998	0.77088
1999	1.07589
2000	1.184
2001	1.14309
2002	1.30568
2003	1.38989
2004	1.20892
2005	1.10647
2006	1.01999
2007	0.94938
2008	0.9646
2009	1.2056
2010	1.39243
2011	1.18283
2012	1.17577
2013	1.10667
2014	0.95191
2015	0.84392
2016	0.80627
2017	0.72166