Year	Percent
1999	9.18454
2000	10.73111
2001	10.91552
2002	8.87882
2003	8.94125
2004	8.56083
2005	8.86073
2006	8.40398
2007	7.51554
2008	7.98386
2009	10.42612
2010	10.47916
2011	10.00504
2012	11.35661
2013	11.48752
2014	12.81095
2015	13.02287
2016	12.53606