65% (1987)

56% (2005)

60% (1980)

60% (2016)

56% (1996)

68% (1985)

69% (1967)

61% (1990)

62% (2001)

49% (1991)

60% (1982)

60% (1987)

66% (1994)

56% (1980)

61% (1990)

62% (1998)

63% (2009)

69% (1977)

66% (1974)

57% (2006)