Year	Percent
1998	5.9129
1999	9.9633
2000	7.9198
2001	7.7718
2002	7.0788
2003	9.4807
2004	12.4895
2005	7.1783
2006	5.6191
2007	4.097
2008	4.9121
2009	10.861
2010	13.0297
2011	12.9664
2012	13.7803
2013	9.8516
2014	8.5351
2015	7.3292
2016	7.0933
2017	7.1064