Year	Percent
1990	0.695
1991	1.527
1992	3.463
1993	6.64
1994	7.932
1995	8.861
1996	9.227
1997	9.5429
1998	8.513
1999	10.1466
2000	11.6139
2001	13.2367
2002	8.6794
2003	10.383
2004	8.8339
2005	6.9114
2006	5.5853
2007	3.7571
2008	5.1376
2009	10.3068
2010	14.097
2011	11.5788
2012	9.1017
2013	8.1557
2014	6.8136
2015	6.1345
2016	6.0684
2017	5.3002