72% (1998)

69% (1989)

63% (1990)

56% (1987)

73% (1992)

57% (1990)

65% (1989)

68% (2000)

65% (1984)

61% (1988)

70% (1995)

61% (1999)

73% (1995)

63% (1991)

69% (1992)

62% (1987)

63% (1998)

61% (1997)

42% (1996)

60% (1988)