77% (1969)

76% (1986)

60% (1972)

62% (1976)

74% (1983)

64% (1996)

53% (1999)

66% (2007)

62% (1982)

70% (1976)

57% (2007)

54% (1998)

57% (2001)

63% (1997)

62% (1974)

67% (1974)

56% (2002)

69% (1995)

63% (1983)

57% (1972)