61% (1998)

65% (1995)

59% (1990)

58% (1993)

45% (2002)

43% (2001)

73% (1976)

49% (1995)

65% (1999)

62% (1997)

58% (2000)

48% (2003)

60% (1994)

51% (1990)

53% (1992)

55% (1989)

57% (1993)

61% (1999)

52% (1988)

42% (1987)