39% (2002)

42% (1999)

40% (2005)

44% (2001)

34% (2001)

37% (1998)

38% (2002)

30% (2000)

44% (1999)

39% (2002)

53% (1997)

48% (1999)

48% (1998)

50% (2000)

24% (1999)

35% (2002)

50% (2007)

42% (1997)

35% (1987)

32% (1998)