Year	Percent
1994	3.5286
1995	3.92436
1996	3.46738
1997	3.60617
1998	3.7152
1999	4.89795
2000	5.91579
2001	6.4505
2002	6.84589
2003	6.25651
2004	7.07093
2005	6.34741
2006	5.46418
2007	4.58727
2008	3.91492
2009	4.11109
2010	5.25568
2011	4.77534
2012	5.1394
2013	5.18212
2014	4.84003
2015	4.41013
2016	3.49692
2017	2.84571