Year	Percent
1983	84.31925
2004	77.05985
2005	74.98119
2006	76.38246
2007	75.58684
2008	84.37489
2009	85.63815
2010	80.99292
2011	81.86679
2012	81.23618
2013	82.40603
2014	73.46951
2015	77.48643
2016	72.40406