Year	Percent
1998	61.29748
1999	64.40717
2000	68.46373
2001	73.58268
2002	71.96577
2003	65.09407
2004	60.92935
2005	54.10623
2006	52.11559
2007	52.29963
2008	50.38598
2009	54.98636
2010	53.95161
2011	50.93689
2012	44.1417
2013	44.05745
2014	43.86328