71% (1987)

67% (1993)

62% (1990)

67% (1986)

77% (1986)

74% (1991)

64% (2001)

59% (1999)

68% (1973)

72% (1996)

50% (1992)

0% (1974)

53% (1988)

60% (1975)

46% (1988)

71% (1999)

48% (1974)

70% (1998)

50% (1988)

65% (1975)