72% (1987)

62% (1990)

77% (1986)

67% (1993)

68% (1986)

70% (1999)

64% (2001)

53% (1988)

74% (1991)

59% (1999)

60% (1975)

48% (1974)

50% (1988)

65% (1975)

72% (1996)

50% (1992)

0% (1988)

50% (1992)

60% (1991)

60% (1994)