67% (2002)

48% (1999)

44% (1998)

37% (2002)

53% (2001)

49% (2006)

48% (2002)

51% (2000)

45% (1998)

53% (2004)

44% (2001)

38% (1997)

35% (1999)

48% (1997)

41% (2001)

55% (2004)