Year	%
1972	9.94576
1973	10.57261
1974	9.86293
1976	10.77341
1985	87.92198
1986	90.97303
1987	90.82379
1988	88.92539
1989	85.41423
1990	85.11948
1991	90.71514
2011	78.31703
2012	75.72798
2013	72.76072
2014	70.04375
2015	73.30081
2016	88.17147
2017	73.41762