37% (1995)

79% (1964)

62% (1978)

54% (1972)

63% (1982)

75% (1978)

70% (1993)

61% (1977)

45% (1990)

49% (1985)

63% (1980)

46% (1980)

67% (1984)

43% (1986)

67% (1990)

59% (1968)

70% (1992)

59% (1979)

43% (1999)

61% (2002)