58% (1981)

72% (1973)

51% (1982)

67% (1977)

56% (2003)

49% (1976)

54% (1983)

52% (1988)

48% (1982)

50% (1985)

57% (1981)

56% (1988)

60% (1980)

50% (1978)

57% (1980)

55% (1976)

49% (1989)

49% (1970)

48% (1970)

59% (2004)