50% (1967)

70% (1998)

73% (1992)

56% (1987)

56% (1957)

64% (1959)

75% (2003)

57% (1965)

47% (1999)

60% (1963)

53% (1968)

62% (1975)

65% (2001)

62% (1992)

60% (1955)

55% (1954)

60% (1959)

57% (1955)

68% (1991)

69% (2018)