56% (1995)

62% (1998)

66% (1996)

63% (1996)

60% (2000)

61% (1995)

62% (1997)

48% (1997)

51% (2000)

47% (1997)

51% (1997)

53% (1993)

52% (1994)

30% (1994)

65% (1998)