50% (1989)

53% (2005)

71% (1972)

72% (2009)

60% (1990)

58% (1977)

57% (1991)

63% (1989)

67% (1966)

56% (1996)

0% (1978)

57% (1992)

38% (1980)

50% (1995)

68% (2001)

47% (2004)

60% (1982)

0% (1985)

50% (1995)

70% (2003)