61% (2012)

66% (1976)

63% (1975)

63% (1974)

51% (1996)

50% (1977)

61% (1968)

60% (1973)

65% (1971)

21% (1979)

60% (1973)

0% (1980)

63% (1977)

68% (1973)

67% (1975)

64% (1969)

62% (2005)

47% (1993)

60% (1974)

40% (1981)