51% (1997)

34% (1994)

20% (1996)

40% (1996)

48% (1995)

55% (1995)

39% (1995)

49% (1995)

46% (1993)

40% (1995)

60% (1999)

44% (2000)

35% (1994)

48% (1995)

49% (1996)

42% (1997)

32% (1992)

30% (1996)

34% (1994)

50% (1994)