68% (1967)

55% (1976)

59% (1979)

60% (1966)

35% (1988)

49% (1972)

59% (1953)

0% (1977)

48% (1955)

48% (1980)

49% (1957)

30% (1991)

50% (1980)

60% (1976)

57% (1987)

67% (1981)

55% (1961)

50% (1969)

54% (1956)

70% (1967)