Year	Percent
1996	4.10749
1997	7.45057
1998	9.05211
1999	9.98159
2000	7.47178
2001	6.70793
2002	6.10955
2003	3.55589
2004	2.63559
2005	2.55663
2006	2.11954
2007	2.24087
2008	1.98112
2009	2.33841
2010	2.33694
2011	3.89142
2012	3.64215
2013	3.15737
2014	4.16105
2015	3.81223
2016	3.87534