45% (1980)

68% (1989)

59% (1963)

45% (1992)

62% (2001)

51% (1996)

53% (1979)

20% (1994)

67% (1982)

46% (1998)

50% (2009)

56% (1977)

49% (2013)

50% (1991)

33% (1987)

46% (1991)

58% (2004)

20% (1994)

57% (1988)

68% (2005)