58% (1977)

66% (1994)

69% (1983)

72% (1985)

54% (2002)

64% (1997)

80% (1953)

53% (2000)

43% (1988)

67% (1997)

57% (1993)

41% (2001)

50% (1995)

55% (1986)

63% (1997)

43% (2005)

25% (2003)

49% (1995)

20% (1982)

0% (1985)