47% (1999)

50% (2000)

51% (1996)

38% (1995)

56% (1994)

41% (1999)

37% (1998)

45% (1997)

42% (1991)

54% (1997)

67% (1997)

32% (1993)

59% (1992)

57% (1998)

52% (1997)

38% (1997)

35% (1997)

46% (1995)

58% (1999)

35% (2001)