72% (1978)

62% (1979)

59% (1968)

63% (1977)

55% (1982)

57% (1979)

67% (1979)

57% (1981)

55% (1975)

63% (1974)

75% (1995)

48% (1980)

40% (1977)

65% (1982)

35% (1974)

68% (1963)

50% (1965)

67% (1975)

63% (1973)

63% (2016)