38% (1976)

56% (2001)

60% (1996)

40% (2002)

55% (1979)

60% (2004)

70% (1977)

30% (1971)

65% (1973)

68% (1975)

60% (1974)

53% (1978)

54% (1973)

36% (1999)

60% (2000)

63% (1975)

70% (1993)

0% (1979)

67% (1979)

81% (1982)