78% (1979)

66% (1981)

58% (1987)

64% (2003)

67% (2009)

69% (1997)

55% (1988)

43% (1986)

63% (1989)

74% (1982)

59% (2009)

43% (1988)

82% (1998)

63% (1984)

53% (1982)

56% (1982)

65% (1987)

67% (1987)

51% (1998)

49% (1990)