77% (1986)

69% (1994)

56% (1980)

57% (2004)

67% (1983)

73% (1967)

55% (2011)

69% (2003)

61% (1989)

64% (1998)

31% (1992)

20% (1991)

63% (1995)

64% (1996)

65% (1993)

72% (1995)

58% (2012)

51% (2010)

44% (1979)

68% (2001)