69% (1989)

70% (1985)

67% (1981)

55% (1991)

49% (1994)

65% (1984)

62% (1986)

59% (1989)

62% (1988)

50% (1992)

49% (1995)

47% (1987)

60% (1987)

57% (1986)

54% (1995)

60% (1980)

49% (1993)

64% (1986)

63% (1989)

47% (1979)