70% (1974)

34% (2004)

56% (1971)

73% (1986)

75% (1974)

30% (2006)

76% (1983)

42% (2005)

55% (1969)

31% (2005)

69% (1979)

69% (1973)

36% (2007)

60% (1981)

29% (2008)

65% (1979)

64% (1975)

79% (1976)

48% (1964)

65% (1972)