Year	Percent
1992	5.426
1993	3.579
1994	4.43
1995	4.902
1996	5.574
1997	6.77
1998	8.655
1999	6.702
2000	3.249
2001	3.984
2002	3.439
2003	4.091
2004	4.505
2005	3.952
2006	2.725
2007	2.467
2008	3.991
2009	4.185
2010	3.5021
2011	3.1147
2012	3.1625
2013	3.0314
2014	2.7619
2015	2.6964
2016	3.2822
2017	2.9557