Year	Percent
2002	70.92579
2003	70.99249
2004	71.13497
2005	71.73503
2006	72.39753
2007	72.89336
2008	73.7326
2009	72.72653
2010	74.07839
2011	73.22554
2012	74.36898
2013	74.09868
2014	74.58833
2015	74.55633
2016	74.46
2017	74.21665