45% (1991)

73% (1977)

58% (1975)

58% (1990)

75% (1981)

60% (1993)

41% (1971)

60% (1984)

48% (1989)

30% (1980)

59% (1976)

30% (1986)

40% (1991)

45% (1964)

59% (1967)

54% (1987)

58% (1988)

47% (1996)

42% (1990)

35% (1968)