72% (1998)

64% (1984)

69% (1992)

63% (1998)

69% (2000)

63% (1990)

61% (1999)

73% (1995)

69% (1989)

42% (1996)

61% (1997)

63% (1987)

62% (1988)

66% (1989)

72% (1992)

63% (1991)

56% (1987)

60% (1988)

63% (1991)

61% (1989)