60% (1980)

70% (1981)

67% (1994)

62% (2007)

62% (1997)

59% (1991)

53% (1986)

20% (1991)

62% (1979)

64% (1970)

53% (2005)

46% (1980)

75% (1984)

68% (1973)

57% (1974)

61% (1987)

43% (1970)

55% (1966)

55% (1968)

48% (1976)