51% (1981)

20% (1984)

57% (1971)

63% (2003)

47% (2007)

50% (1984)

28% (1975)

20% (1981)

37% (1980)

43% (1977)

50% (1972)

62% (1972)

20% (1980)

70% (1967)

62% (1974)

63% (1964)

0% (1973)

69% (1960)

60% (2004)

40% (1973)