64% (1986)

61% (2001)

68% (1977)

72% (1978)

55% (1996)

70% (1972)

63% (1992)

74% (1987)

54% (1984)

64% (1994)

68% (1979)

67% (1981)

72% (1989)

62% (1988)

57% (1998)

69% (2013)

62% (1990)

67% (1990)

71% (1988)

63% (1976)