48% (1993)

54% (1996)

66% (1999)

54% (1996)

66% (1995)

59% (1989)

53% (1998)

43% (1994)

62% (1993)

59% (1997)

46% (1998)

51% (1990)

64% (1998)

35% (1994)

43% (1999)

40% (1995)

48% (1987)

60% (1998)

62% (1996)

38% (1992)