58% (1998)

51% (1990)

50% (1998)

53% (1990)

61% (1999)

43% (1999)

74% (1998)

60% (1998)

40% (1988)

44% (1997)

59% (1997)

40% (1995)

27% (1994)

62% (1996)

62% (1993)

64% (1998)

54% (1996)

48% (1995)

44% (1998)

48% (1987)