10% (1994)

37% (1995)

38% (2003)

36% (1988)

49% (1990)

32% (1996)

31% (2001)

48% (1993)

40% (1996)

35% (1992)

41% (1991)

30% (1995)

58% (1995)

34% (2002)

47% (1990)

40% (1994)

44% (1992)

54% (1991)

33% (1996)

39% (1995)