74% (1962)

68% (2005)

64% (1993)

63% (2015)

58% (1992)

53% (2014)

51% (2009)

80% (1999)

43% (2004)

51% (1990)

54% (2015)

61% (2005)

58% (2014)

32% (1998)

64% (1996)

60% (2003)

70% (1995)

75% (1964)

68% (1992)

50% (2006)