58% (1984)

64% (1984)

59% (1985)

53% (1989)

59% (1986)

49% (1993)

45% (2009)

65% (1991)

55% (1992)

30% (1993)

50% (1995)

54% (1995)

40% (1994)

26% (1995)

42% (1989)

40% (1992)