73% (1976)

49% (2004)

65% (1995)

65% (1999)

44% (2001)

45% (2002)

49% (1995)

61% (1998)

49% (1986)

58% (1993)

62% (1997)

49% (2003)

51% (1990)

59% (1990)

52% (1992)

59% (2000)

57% (1993)

54% (1989)

55% (1998)

51% (1986)