65% (1984)

59% (1998)

66% (2001)

47% (1975)

53% (1983)

71% (1999)

67% (1985)

52% (2005)

56% (1986)

64% (1995)

63% (1981)

53% (1973)

42% (1974)

47% (2006)

52% (1972)

61% (1974)

54% (1986)

80% (1975)

67% (1975)

10% (1975)