57% (1991)

54% (1996)

61% (1992)

61% (1994)

53% (1994)

61% (1992)

56% (2000)

58% (1993)

54% (1996)

55% (1992)

51% (1992)

65% (1995)

56% (1993)

66% (1997)

60% (1991)

51% (1994)

54% (1992)

55% (1995)

48% (1995)

55% (1996)