60% (1974)

65% (1982)

30% (1990)

53% (1984)

58% (1989)

67% (1969)

45% (1978)

40% (1996)

35% (1984)

73% (1987)

50% (1977)

40% (1996)

64% (1993)

52% (1999)

37% (1987)

30% (1989)

60% (1977)

58% (1999)

50% (1980)

0% (1979)