Year	Percent
1998	13.74373
1999	13.47692
2000	11.21975
2003	11.25883
2008	12.93561
2009	12.59804
2010	12.12291
2011	14.5554
2012	13.27213
2013	14.09308
2014	14.98144
2015	15.09517
2016	13.32624