Year	Percent
1998	22.38859
1999	21.33407
2000	21.75482
2001	20.67893
2002	22.25691
2003	21.84159
2004	23.55072
2005	23.60149
2006	23.12511
2007	23.68994
2008	24.79804
2009	26.77248
2010	26.17976
2011	25.72188
2012	26.60227
2013	22.60942
2014	22.40769