63% (1988)

66% (1993)

54% (2010)

61% (1985)

63% (1982)

60% (1987)

57% (1981)

39% (2001)

43% (1964)

77% (2002)

73% (2013)

77% (2008)

62% (2012)

48% (2003)

62% (1998)

53% (2007)

64% (2011)

38% (2004)

70% (2002)

50% (1993)