Year	Percent
1993	2.528
1994	2.526
1995	2.554
1996	2.509
1997	2.9649
1998	3.7548
1999	5.8246
2000	6.0217
2001	5.6244
2002	4.7719
2003	4.9252
2004	5.7513
2005	5.2821
2006	4.7283
2007	3.4911
2008	2.7974
2009	4.7936
2010	5.2032
2011	4.6386
2012	4.7794
2013	4.8838
2014	4.3431
2015	3.7171
2016	2.796
2017	2.0393