71% (1979)

77% (1979)

73% (1980)

71% (1994)

64% (1995)

67% (1978)

71% (1996)

68% (1976)

69% (1982)

67% (1982)

77% (1969)

60% (1984)

63% (1981)

71% (1979)

63% (1980)

64% (2006)

40% (1990)

71% (1977)

66% (1994)

64% (2000)