61% (2003)

43% (1999)

64% (1974)

44% (1983)

70% (1994)

49% (1983)

59% (1968)

58% (1972)

51% (1986)

60% (2006)

63% (1990)

56% (1975)

53% (1996)

69% (1975)

62% (1974)

70% (1986)

53% (1974)

60% (1975)

87% (2007)

46% (1993)