53% (2004)

67% (1999)

68% (2000)

66% (1997)

68% (1999)

66% (1994)

55% (1988)

58% (1979)

61% (1996)

60% (1996)

52% (1986)

30% (1982)

57% (1996)

50% (1980)

40% (1997)

70% (1978)

62% (1977)

60% (1991)

15% (1997)

0% (1978)