48% (1980)

0% (1970)

40% (1978)

60% (1979)

70% (1975)

50% (1974)

53% (1981)

67% (1987)

48% (1988)

78% (1976)

60% (1980)

60% (1974)

10% (1988)

53% (1982)

60% (1980)

70% (1980)