60% (1975)

76% (1969)

67% (1958)

53% (1973)

59% (1968)

65% (1994)

44% (1983)

55% (1975)

45% (1997)

63% (1974)

59% (2006)

43% (1999)

60% (1995)

64% (1977)

69% (1975)

49% (1983)

45% (2004)

60% (1974)

53% (1996)

87% (2007)