63% (1983)

70% (1995)

66% (2007)

62% (1997)

61% (1982)

32% (1999)

63% (1980)

59% (1976)

63% (1997)

69% (1971)

70% (1976)

53% (1999)

47% (1984)

62% (1988)

64% (1996)

72% (1969)

61% (1976)

62% (1977)

58% (1983)

61% (1975)