63% (2008)

58% (1987)

70% (1985)

30% (1981)

62% (1978)

50% (2004)

0% (1975)

67% (1967)

52% (1989)

68% (1992)

70% (1981)

36% (1982)

0% (2014)

46% (1990)

73% (1987)

60% (1986)

0% (1965)

30% (1969)

48% (1968)

70% (1973)