Year	Percent
1992	5.5043
1993	4.91229
1994	5.23356
1995	6.11804
1996	7.62857
1997	9.55659
1998	7.85679
1999	8.27644
2000	8.68144
2001	10.2548
2002	12.15195
2003	12.2459
2004	13.01556
2005	11.39542
2006	9.85339
2007	8.20845
2008	8.35449
2009	9.75684
2010	9.1501
2011	7.55671
2012	9.90948
2013	10.21702
2014	8.42516
2015	8.98048
2016	11.61767