56% (1999)

59% (2002)

46% (1990)

67% (1981)

58% (1996)

65% (1984)

80% (1980)

64% (1983)

65% (1992)

80% (1984)

10% (1994)

70% (1997)

56% (1989)

42% (1994)

60% (1997)

48% (1997)

64% (1995)

0% (1985)

20% (1988)

30% (2000)