75% (1993)

68% (1988)

32% (2004)

75% (1989)

77% (1982)

53% (1980)

69% (1981)

47% (1994)

72% (1989)

61% (1990)

55% (1999)

50% (1979)

43% (1992)

50% (1992)

59% (1994)

68% (1984)

45% (1986)

53% (1995)

52% (1986)

55% (1982)