Year	Percent
1999	13.32
2000	9.74
2001	8.69
2002	8.1
2003	9.57
2004	10.08
2005	8.66
2006	8.91
2007	6.23
2008	4.54
2009	7.83
2010	9.0845
2011	7.7257
2012	6.821
2013	6.0278
2014	4.623
2015	4.4524
2016	5.4643
2017	4.8282