63% (1990)

64% (1991)

69% (1989)

65% (1984)

72% (1992)

72% (1998)

56% (1987)

62% (1999)

62% (1988)

63% (1987)

69% (1992)

63% (1998)

73% (1995)

66% (1989)

61% (1997)

42% (1996)

60% (1988)

67% (1997)

69% (2000)

63% (1991)