61% (1995)

67% (2003)

60% (1976)

69% (1982)

50% (1987)

54% (1980)

58% (1984)

67% (1995)

57% (1998)

45% (1985)

62% (1979)

0% (1980)

10% (1978)

51% (1996)

50% (1996)

50% (1994)

47% (1987)

60% (1986)

78% (1987)

50% (1988)