Year	Percent
1999	11.24295
2000	13.72562
2001	15.77867
2002	13.64919
2003	13.31403
2004	13.23403
2005	16.62291
2006	16.56822
2007	16.55132
2008	15.81809
2009	12.95636
2010	13.04836
2011	13.91519
2012	13.74247
2013	12.90728
2014	13.22697
2015	10.60383
2016	9.12636