57% (2000)

52% (1996)

53% (1998)

47% (1997)

54% (1999)

45% (1996)

56% (1987)

36% (1996)

56% (1998)

50% (1983)

67% (1986)

100% (1989)

53% (1997)

90% (1995)

60% (1987)