Year	Percent
1998	7.74103
1999	8.36127
2000	8.07213
2001	7.1992
2002	6.49298
2003	6.77369
2004	7.26432
2005	6.83012
2006	7.44399
2007	7.61565
2008	8.62497
2009	9.70848
2010	8.92227
2011	8.38398
2012	9.27728
2013	11.28129
2014	12.5823
2015	12.97548
2016	11.77508