53% (1998)

54% (1999)

52% (1996)

56% (1998)

46% (1997)

57% (2000)

45% (1996)

56% (1987)

50% (1983)

53% (1997)

36% (1996)

90% (1995)

67% (1986)

60% (1987)

100% (1989)