81% (1982)

67% (1986)

65% (1994)

61% (1986)

58% (1994)

62% (1984)

63% (1975)

42% (1977)

0% (1983)

63% (1985)

62% (1988)

54% (1978)

0% (1982)

70% (1986)

70% (1988)

56% (1980)

63% (1988)

65% (1981)