Year	Percent
1995	22.7813
1996	22.65221
1997	21.80455
1998	24.99659
1999	23.03831
2000	22.15868
2001	20.84307
2002	21.34957
2003	20.6178
2004	19.86406
2005	19.78193
2006	19.8579
2007	19.92957
2008	20.01035
2009	19.24031
2010	19.10865
2011	18.42706
2012	19.54941
2013	19.02531
2014	19.12356