25% (1984)

35% (2005)

49% (1994)

20% (1993)

40% (1998)

45% (1992)

20% (1994)

35% (1999)

50% (1994)

50% (1980)

35% (1999)

60% (1993)

20% (1996)

64% (2002)

40% (1965)

20% (1996)

61% (1995)

45% (1985)

60% (1994)

25% (1987)