Year	Percent
1998	26.04068
1999	25.29324
2000	24.66126
2001	25.29121
2002	26.88653
2003	26.6065
2004	25.46407
2005	25.36203
2006	23.84324
2007	22.80694
2008	28.20173
2009	26.9248
2010	26.2857
2011	25.89147
2012	25.97821
2013	25.64591
2014	25.25511