70% (1988)

60% (1987)

58% (1983)

59% (1987)

55% (1979)

64% (1977)

54% (1983)

58% (1985)

57% (1981)

53% (1984)

60% (1983)

30% (1980)

50% (1974)

60% (1984)

63% (1982)

70% (1994)

61% (1985)

58% (1981)

0% (1992)

0% (1979)