53% (2004)

66% (1999)

69% (1995)

68% (2000)

68% (1994)

66% (1997)

60% (1996)

68% (1999)

61% (1996)

55% (1988)

50% (1983)

34% (1982)

47% (1997)

20% (1980)

0% (1978)

52% (1986)

57% (1979)

0% (1978)

50% (1980)

62% (1977)