Year	Percent
1999	14.60051
2000	16.55834
2001	19.16557
2002	15.45934
2003	12.02214
2004	10.5113
2005	11.8567
2006	11.58418
2007	8.75512
2008	6.41948
2009	8.77522
2010	8.36546
2011	8.81192
2012	8.40627
2013	6.58352
2014	5.7036
2015	6.823
2016	7.60072