35% (1973)

64% (1983)

46% (1976)

62% (2011)

58% (2001)

65% (1987)

48% (1982)

0% (1989)

62% (1972)

68% (1984)

60% (1973)

35% (1980)

73% (1983)

80% (1996)

30% (1990)

61% (1976)

67% (1977)

0% (1995)

69% (1977)

50% (1999)