62% (2012)

71% (2015)

65% (2018)

54% (1984)

78% (2008)

64% (1997)

66% (1996)

63% (1998)

53% (2000)

68% (2001)

61% (2003)

64% (1989)

75% (2010)

63% (1976)

53% (1990)

55% (1990)

70% (1993)

48% (1997)

58% (1992)

70% (1990)