Year	Percent
1984	11.41
1990	5.52
1991	4.33
1992	4.73
1993	3.16
1994	2.27
1995	3.72
1998	5.2
2000	7.5
2001	10.12
2003	10.32
2004	6.9966
2005	6.7466
2006	6.9637
2007	5.0022
2008	5.3227
2009	4.3932
2010	3.2621
2011	3.118
2012	2.7417
2013	2.7856
2014	2.9404
2015	3.5284
2016	3.85
2017	3.4836