62% (2012)

78% (2008)

71% (2015)

65% (2018)

54% (1984)

65% (1996)

63% (1997)

62% (1998)

63% (1989)

77% (1993)

58% (1989)

61% (1994)

66% (1996)

53% (2000)

48% (1997)

75% (2010)

52% (1990)

60% (2003)

63% (1976)

57% (1990)