55% (1987)

57% (1975)

57% (1981)

55% (1980)

46% (1986)

52% (1979)

51% (1978)

60% (1976)

28% (2000)

54% (1983)

53% (1980)

47% (1983)

73% (1981)

58% (1980)

55% (1983)

54% (1980)

45% (1978)

58% (1981)

58% (1983)

68% (2004)