Year	Percent
1999	28.68252
2000	28.28093
2001	28.19174
2002	28.39384
2003	29.74701
2004	29.17081
2005	27.11621
2006	27.11214
2007	26.55656
2008	26.92613
2009	28.58829
2010	28.23922
2011	27.06906
2012	26.88816
2013	26.81669
2014	26.85506