Year	Percent
1998	23.87749
1999	24.05752
2000	22.833
2001	22.10772
2002	22.83037
2003	23.18286
2004	23.213
2005	22.88599
2006	23.46748
2007	23.70022
2008	25.37782
2009	27.61234
2010	26.05485
2011	25.89151
2012	23.4771
2013	22.59189
2014	22.22584