52% (1992)

70% (2003)

62% (1986)

66% (1993)

77% (1987)

70% (1985)

79% (1992)

50% (1997)

55% (1980)

65% (1992)

73% (1990)

73% (1993)

64% (1989)

77% (1987)

43% (2001)

71% (1988)

62% (1993)

63% (1995)

0% (1980)

65% (1991)