Year	%
1975	84.48523
1976	92.94665
1977	85.62092
1981	48.91947
1982	36.42408
1983	32.30119
1984	46.89138
2006	54.99937
2007	67.84825
2008	56.4177
2009	69.6735
2010	69.9588
2011	72.60321
2012	73.24068
2013	70.03521
2014	69.72656
2015	68.38689
2016	62.48889
2017	66.37433