57% (1983)

63% (1997)

49% (1998)

30% (2000)

41% (2003)

45% (1983)

59% (2006)

44% (1994)

58% (1995)

65% (1998)

43% (1993)

58% (1998)

45% (2007)

49% (2006)

45% (1994)

47% (1997)

49% (1994)

24% (1995)

50% (1997)

55% (2003)