61% (1998)

60% (1996)

64% (1995)

62% (1994)

67% (1995)

76% (1994)

50% (1993)

63% (1996)

56% (1994)

64% (1994)

54% (1996)

66% (1991)

58% (2001)

51% (2004)

60% (1994)

67% (1996)

55% (1998)

53% (2001)

65% (1999)

49% (1999)