68% (1993)

63% (1990)

67% (1986)

64% (2001)

70% (1999)

72% (1987)

77% (1986)

74% (1991)

60% (1975)

59% (1999)

48% (1974)

65% (1986)

90% (1974)

70% (1998)

68% (1973)

53% (1988)

50% (1988)

46% (1988)

43% (1976)

65% (1975)