Year	Percent
1998	78.74726
1999	56.29756
2000	54.93566
2001	47.20096
2002	44.49315
2004	32.49552
2005	34.7812
2007	29.14269
2008	27.15105
2009	27.84097
2010	27.81947
2011	27.57747
2012	28.05946
2013	29.15253
2014	29.00551