Year	%
1980	72.19602
1983	73.90027
1984	60.44589
1986	68.35247
1987	68.8042
1999	75.93657
2000	82.22398
2001	70.52063
2002	80.02063
2003	84.84721
2004	88.46847
2005	85.43639
2007	84.18822
2008	85.96598
2009	86.99057
2010	93.73234
2014	77.75646
2015	88.49901
2016	77.23082