Year	Percent
1992	4.10071
1994	5.67687
1995	7.51565
1996	17.57155
1997	6.3576
1998	6.20018
1999	6.0938
2000	5.31418
2001	1.65963
2002	1.34917
2003	1.2704
2004	1.62263
2005	0.81384
2006	0.61017
2007	0.60702
2008	0.60376
2009	0.72249
2010	0.72235
2011	0.73861
2012	0.74138
2013	0.75726
2014	0.74964
2015	0.75768
2016	0.7688
2017	0.81417
2018	0.78923
2019	0.81812
2020	0.83255