70% (1981)

63% (1981)

57% (1990)

42% (1983)

63% (1982)

55% (1980)

53% (1989)

53% (1979)

50% (1982)

48% (1983)

42% (1989)

51% (1988)

43% (1992)

31% (1980)

51% (1987)

49% (1984)

55% (1985)

58% (1979)

50% (1990)

48% (1988)