80% (1982)

80% (1995)

67% (1984)

67% (1998)

74% (2007)

61% (1985)

70% (1981)

75% (1983)

61% (1982)

61% (1995)

53% (1996)

69% (2005)

61% (1981)

65% (1981)

58% (1996)

45% (1985)

64% (1983)

56% (1984)

66% (1983)

58% (1982)