48% (1998)

62% (2004)

60% (1989)

59% (2004)

54% (2007)

46% (1993)

55% (1993)

53% (2011)

58% (2005)

55% (1992)

65% (1985)

52% (1998)

57% (2009)

58% (2004)

56% (2001)

80% (1977)

77% (1982)

56% (1999)

56% (1981)

51% (2005)