60% (1987)

64% (1997)

75% (1983)

68% (1979)

50% (1997)

62% (1981)

60% (1987)

60% (1987)

50% (1994)

55% (1988)

51% (1994)

55% (1980)

59% (1981)

72% (1979)

59% (1992)

58% (1998)

63% (1985)

70% (1981)

61% (1994)

72% (1984)