81% (1974)

79% (1972)

78% (1982)

73% (1976)

75% (1969)

76% (1968)

68% (1984)

53% (1977)

69% (1984)

70% (1969)

63% (1971)

61% (1986)

60% (2001)

55% (1981)

71% (1976)

70% (1970)

0% (1991)

90% (1974)

65% (1979)

0% (1987)