77% (1969)

70% (1994)

59% (1984)

74% (1999)

61% (1979)

68% (1977)

70% (1972)

64% (1975)

60% (1970)

70% (1976)

61% (1979)

69% (1968)

37% (1996)

74% (2005)

73% (1962)

70% (1967)

59% (1972)

55% (1973)

55% (1965)

68% (1979)