66% (1988)

69% (1978)

75% (1983)

54% (1969)

75% (1974)

55% (1971)

59% (1981)

32% (2005)

34% (2004)

70% (1974)

41% (2005)

30% (2006)

36% (2007)

0% (1966)

65% (1979)

61% (1970)

70% (1973)

69% (1975)

50% (1972)

59% (1974)