Year	Percent
1999	53.56156
2000	54.27124
2002	25.31043
2003	20.14351
2004	19.03898
2005	21.52513
2006	19.16928
2007	15.98386
2008	16.37552
2009	15.45667
2010	23.19014
2011	28.77916
2012	49.4796
2013	19.09711
2014	17.31607
2015	24.54288