59% (1980)

70% (1981)

67% (1994)

62% (1997)

62% (2007)

59% (1991)

67% (2006)

20% (1991)

53% (1986)

68% (1973)

53% (2005)

55% (1975)

63% (1979)

64% (1970)

65% (2002)

43% (1970)

52% (1982)

54% (1985)

60% (2013)

46% (1980)