Year	Percent
1998	27.04631
1999	24.90773
2000	24.45585
2001	24.1736
2002	24.3689
2003	24.37179
2004	31.64553
2005	30.77463
2006	29.93903
2007	29.04545
2008	29.196
2009	31.19894
2010	30.22184
2011	31.08369
2012	31.0858
2013	24.64255
2014	24.75704