Year	Percent
2003	12.025
2004	9.94379
2005	13.20951
2007	17.76657
2008	15.91172
2009	18.39141
2010	22.04498
2011	21.61996
2012	22.24456
2013	22.82121
2014	22.96152
2015	21.64037
2016	21.19201