Year	Percent
2001	32.16516
2002	25.95579
2003	22.6037
2004	21.68958
2005	23.14595
2007	25.02322
2009	21.83079
2010	19.94867
2011	19.36868
2012	21.9189
2013	23.09007
2014	23.21495