53% (1998)

50% (1998)

63% (1997)

51% (1996)

40% (1993)

53% (1999)

57% (1995)

44% (1999)

56% (1996)

51% (1999)

43% (1998)

44% (1999)

45% (1997)

59% (1997)

52% (1994)

55% (1997)

57% (1996)

57% (1994)

47% (1997)

45% (1995)