Year	Percent
1992	0.40048
1994	5.2845
1995	3.66408
1996	3.58461
1997	3.79267
1998	3.2906
1999	3.29637
2000	4.45826
2001	4.99061
2002	3.77041
2003	4.79043
2004	4.72193
2005	6.15389
2006	8.05747
2007	10.84504
2008	11.14479
2009	9.9944
2010	10.60838
2011	10.21172
2012	10.4215
2013	10.33112
2014	10.13575
2015	11.85277
2016	11.74856