Year	Percent
1998	8.42897
1999	8.42912
2000	8.4145
2002	10.11467
2003	9.27198
2005	8.03619
2006	8.0679
2007	8.01958
2008	8.74011
2010	9.75947
2012	10.32453
2013	11.07936
2014	11.79323
2015	12.06005
2016	14.28656