45% (1991)

73% (1977)

60% (1984)

58% (1990)

60% (1993)

41% (1971)

58% (1975)

48% (1989)

30% (1980)

59% (1976)

59% (1967)

45% (1964)

47% (1996)

30% (1986)

40% (1991)

56% (1994)

35% (1968)

54% (1987)

54% (1970)

42% (1990)