71% (2003)

60% (1985)

52% (1980)

50% (1979)

56% (1982)

58% (1989)

69% (2004)

64% (1995)

51% (1982)

54% (2002)

41% (1981)

60% (1977)

40% (1988)

61% (1983)

56% (1976)

33% (1974)

35% (1989)

44% (1971)

40% (1989)

55% (1990)