60% (1996)

47% (1995)

72% (1976)

70% (1972)

59% (1982)

58% (1995)

58% (1978)

55% (1982)

56% (1983)

56% (1996)

52% (1975)

54% (1988)

73% (1982)

36% (1985)

64% (1993)

70% (1988)

65% (1986)

46% (1975)

61% (1999)

50% (1979)