73% (1991)

72% (1993)

74% (1990)

65% (1995)

65% (1995)

67% (1983)

68% (1991)

67% (1986)

73% (1989)

45% (1999)

59% (1996)

58% (2002)

72% (1987)

57% (1984)

59% (1993)

53% (1985)

73% (1989)

49% (1985)

61% (2003)

47% (1987)