Year	Percent
1984	13.37
1990	6.99
1991	7.88
1992	8.29
1993	7.34
1994	8.02
1995	9.52
1998	9.34
2000	13.02
2001	15.47
2003	17.28
2004	13.0547
2005	12.5259
2006	11.1518
2007	10.3306
2008	8.4245
2009	8.3794
2010	7.207
2011	6.243
2012	6.2478
2013	6.0617
2014	6.3756
2015	6.5265
2016	6.9413
2017	6.8619