72% (1993)

65% (1995)

73% (1991)

73% (1990)

72% (1989)

67% (1983)

66% (1986)

73% (1989)

46% (1999)

46% (1986)

65% (1995)

54% (1985)

60% (1996)

57% (1984)

65% (2002)

69% (1991)

73% (1987)

58% (1993)

56% (1990)

59% (2002)