Year	Percent
1998	13.73139
2000	21.65186
2003	19.70902
2005	15.84252
2007	21.17046
2009	17.46983
2010	15.93648
2011	17.68975
2013	17.50001
2014	18.33992
2015	16.77975
2016	18.03809