65% (1987)

63% (1990)

55% (1980)

65% (1982)

55% (1999)

72% (1989)

61% (1986)

58% (1982)

58% (1995)

63% (1976)

75% (1980)

55% (1982)

62% (1983)

55% (1996)

65% (1990)

73% (1982)

56% (1983)

72% (1966)

72% (1976)

70% (1973)