57% (2000)

51% (1996)

54% (1998)

46% (1997)

59% (1987)

67% (1986)

54% (1999)

57% (1998)

60% (1987)

45% (1996)

90% (1995)

42% (1996)

100% (1989)

53% (1997)

50% (1983)