Year	Percent
1999	24.93597
2000	23.22704
2001	24.30857
2002	25.32816
2003	25.99888
2004	31.06666
2005	30.83827
2006	30.50341
2007	29.59148
2008	30.83062
2009	34.36908
2010	34.8965
2011	34.70223
2014	27.24911