57% (1980)

52% (1996)

73% (1979)

50% (1979)

50% (1983)

35% (1987)

55% (1981)

58% (1998)

59% (1991)

62% (1984)

73% (1982)

69% (1981)

46% (1994)

68% (1984)

53% (1989)

61% (1991)

56% (1996)

41% (1997)

75% (1985)

63% (1984)