37% (1976)

59% (1994)

65% (1973)

62% (1994)

40% (2002)

58% (1996)

60% (1978)

57% (1978)

67% (1975)

63% (1988)

51% (1981)

47% (1996)

57% (2002)

47% (1999)

66% (1990)

45% (2005)

55% (2006)

65% (2001)

38% (1999)

55% (1980)