54% (1972)

79% (1964)

63% (1989)

74% (1978)

37% (1995)

60% (1984)

59% (1979)

61% (1977)

59% (1968)

63% (1982)

66% (1991)

53% (1984)

49% (1985)

55% (1995)

45% (1990)

66% (1984)

62% (1978)

70% (1992)

54% (1988)

46% (1980)