Year	Percent
1994	3.754
1995	4.3625
1996	5.0837
1997	5.9957
1998	6.6453
1999	5.3332
2000	7.1386
2001	5.7436
2002	6.7166
2003	7.1875
2004	5.2514
2005	4.5523
2006	4.935
2007	3.3957
2008	1.9231
2009	2.8598
2010	2.8546
2011	4.3676
2012	3.9391
2013	4.1647
2014	4.491
2015	5.694
2016	5.8529
2017	4.6337