Year	Percent
1990	0.20286
1991	0.33151
1992	0.66204
1993	1.19695
1994	1.6087
1995	1.54628
1996	1.92612
1997	2.41431
1998	1.89517
1999	1.38081
2000	1.03738
2001	0.68517
2002	0.72525
2003	0.73866
2004	1.05855
2005	0.27678
2006	0.71988
2007	0.86479
2008	0.81646
2009	1.19515
2010	1.50818
2011	1.32031
2012	1.24385
2013	1.27905
2014	1.26604
2015	1.21722
2016	1.07324
2017	1.05445