59% (1980)

70% (1981)

66% (1994)

59% (1991)

62% (1997)

67% (2006)

20% (1991)

49% (1976)

62% (2007)

64% (1970)

65% (2002)

52% (1982)

55% (1975)

53% (2005)

55% (1968)

50% (1976)

75% (1984)

46% (1980)

60% (2013)

57% (1974)