67% (1982)

77% (1990)

61% (1977)

54% (2012)

69% (1981)

73% (1975)

66% (1985)

65% (1983)

64% (2001)

62% (1999)

54% (1980)

68% (1996)

66% (1978)

60% (2000)

69% (1994)

69% (1974)

68% (1999)

50% (1989)

41% (2008)

59% (2011)