70% (2003)

62% (1986)

48% (1997)

77% (1987)

71% (2001)

70% (1985)

61% (2000)

70% (1990)

42% (1996)

58% (2003)

57% (1994)

71% (1993)

73% (1994)

58% (2001)

70% (1992)

67% (1989)

68% (1993)

57% (1990)

54% (1998)

73% (1993)