61% (1996)

69% (1995)

58% (1994)

62% (1964)

53% (1995)

53% (1991)

52% (1994)

50% (1992)

40% (1973)

49% (1995)

44% (1990)

43% (1968)

0% (1989)

60% (1986)

57% (1994)

0% (1993)

50% (1993)

79% (1986)

63% (1993)

60% (1990)