61% (1999)

42% (1996)

43% (1994)

32% (1998)

31% (1997)

45% (1993)

47% (1995)

35% (1995)

42% (1995)

45% (1996)

46% (1998)

48% (1997)

38% (2000)

48% (1995)

51% (1992)

48% (1992)

48% (1996)

45% (1993)

49% (1994)

44% (2000)