60% (1995)

55% (1996)

34% (1985)

50% (1979)

54% (1988)

63% (1988)

57% (1983)

65% (1987)

56% (1999)

62% (1980)

61% (1999)

70% (1979)

72% (1968)

60% (1986)

37% (1986)

64% (1978)

61% (1986)

69% (1973)

46% (1980)

54% (1985)