Year	Percent
1991	0.37321
1992	0.35158
1993	0.16933
1994	0.09637
1995	0.19734
1996	0.74959
1998	0.35756
1999	0.9873
2000	0.38921
2001	0.42848
2002	0.32569
2003	0.52009
2004	0.31387
2005	0.6389
2006	0.91584
2007	0.65828
2008	0.76719
2009	1.0685
2010	0.72804
2011	0.55407
2012	0.63653
2013	0.69828
2014	0.57634
2015	0.77416
2016	2.96914