42% (1990)

73% (1977)

59% (1976)

68% (1974)

45% (1991)

40% (1991)

60% (1984)

30% (1986)

75% (1981)

58% (1988)

60% (1993)

54% (1987)

58% (1975)

48% (1989)

59% (1993)

80% (1979)

48% (1970)

51% (1969)

30% (1980)

47% (1996)