Year	Percent
1992	7.95319
1993	6.47917
1994	4.75737
1995	4.02028
1996	5.59196
1997	5.07483
1998	5.90945
1999	8.10406
2000	9.35186
2001	9.26734
2002	7.66905
2003	8.89749
2004	7.71902
2005	6.82663
2006	7.05418
2007	6.59445
2008	9.01737
2009	8.68693
2010	7.41859
2011	7.07402
2012	6.41578
2013	7.25968
2014	6.87639
2015	9.0082
2016	8.79281