10% (1988)

67% (1988)

63% (1981)

48% (1980)

55% (1986)

60% (1980)

67% (1987)

63% (1973)

62% (1983)

67% (1974)

67% (1986)

57% (1982)

48% (1988)

50% (1981)

58% (1983)

70% (1983)