77% (1994)

73% (1991)

82% (1993)

78% (1988)

72% (1992)

73% (1984)

62% (1983)

54% (1983)

59% (1986)

56% (1985)

54% (1979)

67% (1988)

60% (1988)

57% (1980)

73% (1979)

72% (1986)

70% (1985)

50% (1986)

44% (1991)

60% (1979)