Year	Percent
1998	26.45973
1999	26.66567
2000	25.61669
2001	28.96487
2002	25.89904
2003	27.12478
2004	25.90226
2005	25.41326
2006	26.91962
2007	23.82647
2008	25.24489
2009	25.25676
2010	23.94346
2011	22.57048
2012	22.85103
2013	23.31637
2014	22.85568