61% (1988)

61% (1987)

70% (1994)

66% (1980)

58% (1986)

40% (1980)

31% (1986)

0% (1987)

42% (1992)

44% (1997)

55% (1979)

56% (1978)

63% (1980)

53% (1987)

63% (1978)

95% (1979)

40% (1978)

0% (1979)

35% (1982)

30% (1976)