62% (1995)

66% (1971)

76% (1966)

69% (1980)

62% (1980)

47% (2008)

51% (2007)

70% (1993)

61% (1986)

70% (1964)

54% (1976)

68% (1977)

60% (1968)

61% (1972)

55% (1973)

47% (1975)

59% (1971)

60% (1979)

59% (1972)

67% (1988)