46% (1997)

58% (1998)

64% (1995)

66% (1995)

59% (1997)

61% (1999)

60% (1998)

51% (1990)

40% (1995)

53% (1990)

43% (1999)

40% (1988)

64% (1998)

27% (1994)

54% (1996)

59% (1989)

62% (1996)

48% (1995)

62% (1993)

44% (1998)