69% (1952)

40% (2007)

70% (2012)

72% (2005)

30% (2009)

64% (1996)

75% (1964)

70% (1975)

55% (2011)

30% (1997)

69% (2005)

48% (1991)

71% (2010)

54% (1975)

60% (2005)

60% (1980)

80% (1970)

62% (1979)

100% (2004)

71% (2003)