Year	Percent
1994	4.06063
1995	3.12129
1996	3.17338
1997	3.6139
1998	3.56063
1999	4.28425
2000	3.63342
2001	3.86199
2002	3.21252
2003	3.80199
2004	5.47907
2005	7.43756
2006	6.71976
2007	5.35423
2008	5.26436
2009	5.70395
2010	6.76777
2011	7.10438
2012	9.21082
2013	10.3125
2014	10.21722
2015	10.28807
2016	9.82592