45% (1991)

58% (1988)

58% (1975)

54% (1987)

51% (1969)

59% (1976)

73% (1977)

60% (1984)

60% (1993)

45% (1964)

48% (1989)

58% (1990)

59% (1993)

30% (1986)

68% (1974)

70% (1969)

80% (1979)

35% (1968)

42% (1990)

0% (1991)