60% (1980)

71% (1981)

66% (1994)

62% (1997)

53% (1986)

62% (2007)

59% (1991)

46% (1980)

43% (1970)

20% (1991)

63% (1979)

68% (2006)

64% (1970)

53% (2005)

65% (2002)

55% (1985)

50% (1976)

75% (1984)

49% (1976)

52% (1982)