58% (1969)

74% (2000)

55% (1987)

37% (1992)

38% (2001)

62% (1981)

62% (1986)

50% (2004)

30% (1992)

0% (1991)

0% (1991)

40% (1974)

70% (2001)

50% (1985)

0% (1986)

0% (1977)

70% (1995)

0% (1996)

0% (1997)

70% (1984)