75% (1993)

50% (1994)

66% (1996)

68% (1988)

50% (1983)

64% (1992)

50% (1979)

50% (1994)

32% (2004)

79% (1982)

75% (1985)

54% (1980)

41% (1997)

50% (1992)

64% (1990)

74% (1994)

50% (1981)

56% (1996)

38% (1994)

70% (2000)