Year	Percent
1990	0.77329
1991	1.22887
1992	1.59169
1993	1.76818
1994	1.58009
1995	1.294
1996	1.3056
1997	1.14377
1998	0.93384
1999	0.75742
2000	0.6207
2001	0.56667
2002	0.67444
2003	0.66498
2004	0.61466
2005	0.55375
2006	0.48291
2007	0.43077
2008	0.43735
2009	0.72651
2010	0.92024
2011	0.86202
2012	0.75787
2013	0.76808
2014	0.74297
2015	0.69853
2016	0.72845
2017	0.67276