Year	Percent
1993	4.459
1994	4.372
1995	4.122
1996	4.002
1997	4.8125
1998	6.8129
1999	9.3365
2000	9.9809
2001	9.0092
2002	8.1176
2003	9.1726
2004	9.1719
2005	9.3436
2006	8.3206
2007	6.6856
2008	5.435
2009	7.3125
2010	7.997
2011	7.5531
2012	7.7851
2013	7.8802
2014	7.1389
2015	5.779
2016	4.4575
2017	3.4328