71% (1972)

73% (2009)

50% (1989)

58% (1977)

72% (1992)

66% (1993)

47% (2004)

57% (1991)

20% (1997)

70% (1960)

57% (1993)

60% (1989)

55% (2002)

61% (1975)

0% (1958)

73% (2000)

53% (2005)

54% (1996)

0% (1987)

59% (1986)