67% (1985)

56% (1986)

61% (1974)

51% (1982)

52% (2005)

42% (1974)

47% (1975)

52% (1972)

53% (1983)

47% (2006)

65% (1984)

64% (1995)

62% (1983)

53% (1973)

67% (1975)

63% (1981)

54% (1986)

41% (1992)

53% (1985)

80% (1975)