63% (1980)

70% (1976)

66% (1971)

69% (1980)

67% (1977)

62% (1975)

51% (2007)

61% (1972)

60% (1970)

72% (1973)

70% (1993)

71% (1964)

58% (1984)

61% (1986)

54% (1976)

58% (1972)

47% (1975)

50% (1996)

48% (1975)

64% (1973)