52% (2008)

30% (1997)

44% (1999)

63% (1977)

40% (1998)

58% (1978)

65% (2002)

61% (1974)

61% (2001)

61% (2009)

70% (2013)

60% (1964)

62% (2003)

53% (1981)

60% (2004)

46% (1981)

55% (1981)

53% (2015)

90% (1948)

17% (1986)