Year	Percent
2002	53.92372
2003	50.88196
2004	51.43387
2005	51.85938
2006	53.36795
2007	53.40034
2008	53.92078
2009	53.77684
2010	52.98811
2011	53.64506
2012	54.73599
2013	56.011
2014	55.64566
2015	56.48484
2016	55.85901
2017	54.99802