60% (1985)

52% (1980)

71% (2003)

56% (1982)

50% (1979)

58% (1989)

70% (2004)

52% (1982)

54% (2002)

61% (1983)

41% (1981)

56% (1976)

64% (1995)

33% (1974)

35% (1989)

42% (1971)

40% (1988)

42% (1972)

60% (1977)

40% (1989)