30% (2000)

38% (2004)

42% (1995)

40% (1996)

46% (1997)

31% (2003)

40% (1998)

23% (1998)

50% (1999)

39% (1998)

53% (1998)

53% (1997)

51% (1997)

32% (1996)

46% (1998)

46% (1997)

57% (1998)

48% (1997)

18% (1996)

33% (1997)