67% (1999)

53% (2004)

66% (1997)

68% (2000)

68% (1999)

66% (1994)

56% (1988)

30% (1982)

61% (1996)

50% (1980)

58% (1979)

52% (1986)

62% (1977)

57% (1996)

70% (1978)

20% (1980)

60% (1996)

0% (1978)

15% (1997)

60% (1991)