71% (1984)

72% (1985)

66% (1992)

57% (1991)

61% (1990)

64% (1986)

20% (1985)

58% (1990)

62% (1992)

56% (1988)

53% (1990)

63% (1991)

0% (1996)

60% (1985)

56% (1991)

60% (1991)

53% (1985)

45% (1992)

0% (1990)

48% (1997)