43% (2001)

44% (2002)

73% (1976)

65% (1995)

60% (1998)

64% (1999)

58% (1993)

59% (2000)

61% (1997)

52% (1992)

59% (1990)

50% (1990)

55% (1989)

51% (1986)

50% (1986)

62% (1999)

57% (1993)

49% (2003)

49% (1995)

58% (1981)