60% (1997)

60% (2001)

47% (1991)

36% (1995)

54% (2002)

50% (1993)

54% (1998)

56% (2000)

49% (1991)

52% (1999)

54% (1988)

45% (1995)

54% (1997)

68% (2000)

52% (1996)

58% (1998)

53% (1993)

45% (1991)

54% (1995)

51% (1989)